version update

Describes the estimate signature + TeX/PDF generation release impact:
signature pad on validation, role-aware accept/reject with signatures,
ProAccepted/ClientAccepted split, estimate.tex/estimate.pdf endpoints
in Yavsc.Api, vector TikZ signatures, PostIt PDF/TeX download buttons,
list refresh + title renames, the lualatex stdin runtime, and the
Emergency stop / log-write / RenderViewToString / Layout fixes.

Co-Authored-By: Claude Code <noreply@anthropic.com>

.env.sample

@@ -15,7 +15,7 @@ POSTGRES_HOST=localhost
 POSTGRES_PORT=5432
 POSTGRES_DB=db
 POSTGRES_USER=pguser
-POSTGRES_PASSWORD=pgpassword
+POSTGRES_PASSWORD=<your pg password>
 
 ANTHROPIC_API_KEY=none
 ANTHROPIC_MAX_TOKENS=0

.forgejo/workflows/buildAndTest.yml

@@ -19,20 +19,21 @@ on:
         required: false
         type: boolean
   push:
-    branches: [ "main" ]
+    branches: [ "main", "release/*", "hotfix/*", "fix/*" ]
   pull_request:
-    branches: [ "main", "release/*" ]
+    branches: [ "main", "release/*", "hotfix/*", "fix/*" ]
 
 jobs:
   build:
     runs-on: docker
     container:
-      image: pazof/yavsc-build-env:debian13-dotnet10-android36-jdk21-v1
+      image: pazof/yavsc-build-env:debian13-dotnet10-android36-jdk21-v2
     steps:
     - name: Clone yavsc
       run: |
+        set -e
         cd /src
-        git clone https://forgejo.pschneider.fr/notazof/yavsc.git _src
+        git clone "${FORGEJO_SERVER_URL}/${FORGEJO_REPOSITORY}.git" _src
         cd _src
         if [ -n "${GITHUB_REF:-}" ]; then
           git fetch origin "$GITHUB_REF"
@@ -40,12 +41,18 @@ jobs:
         fi
         git submodule update --init --recursive
         echo "✅ Checked out at $(git rev-parse HEAD) on $(git branch --show-current 2>/dev/null || echo detached HEAD)"
-
+    - name: Secret scan
+      run: |
+        echo "🔍 Scanning for secrets..."
+        cd /src/_src && dotnet tool restore && dotnet picket git --verbose --redact --exit-code 1 --log-opts -n10 \
+    - name: Build
+      run: |
+        echo "🏗️ Building the solution..."
+        cd /src/_src && dotnet build --verbosity normal
     - name: Test
       run: |
         echo "🚀 Lancement des tests..."
         cd /src/_src && dotnet test \
-          --verbosity normal \
-          --filter="Category!=Platform-Android" \
-          --logger "xunit;LogFileName=test-results.xml" \
-          && echo "✅ Success !" || echo "❌ Fail ($?)!"
+          --report-xunit \
+          --report-xunit-html \
+          --report-xunit-html-filename "test-results.html"

.forgejo/workflows/release.yml

@@ -52,7 +52,7 @@ jobs:
   release:
     runs-on: docker
     container:
-      image: pazof/yavsc-build-env:debian13-dotnet10-android36-jdk21-v1
+      image: pazof/yavsc-build-env:debian13-dotnet10-android36-jdk21-v2
     steps:
       - name: Clone du repo au tag demandé
         env:
@@ -69,7 +69,7 @@ jobs:
           cd /src
 
           if [[ ! -d _src/.git ]]; then
-            git clone --depth=1 https://forgejo.pschneider.fr/notazof/yavsc.git _src
+            git clone --depth=1 "${FORGEJO_SERVER_URL}/${FORGEJO_REPOSITORY}.git" _src
           fi
 
           cd _src
@@ -200,6 +200,7 @@ jobs:
           RELEASE_BODY: ${{ env.RELEASE_BODY }}
           IS_PRERELEASE: ${{ env.IS_PRERELEASE }}
         run: |
+          set -e
           if [[ -z "$TAG" ]]; then
             echo "::error::No tag resolved for the API call."
             exit 1

.gitleaksignore

@@ -0,0 +1,45 @@
+# Exclure uniquement les dossiers de sortie de compilation
+bin/
+obj/
+src/*/bin/
+src/*/obj/
+test/*/bin/
+test/*/obj/
+
+# Toolchain front (Node / esbuild)
+node_modules/
+build/
+package-lock.json
+
+# Exclure les caches lourds
+.git/
+.vs/
+
+.env
+
+.*.env
+
+*.csproj.lscache
+data/
+appsettings.*.json
+appsettings-*.*.json
+
+# Exception: the Testing-environment override for Yavsc.Org is a tracked
+# configuration source, not a secrets file. TestWebApplicationFactory
+# (Yavsc.Org.Tests) flips ASPNETCORE_ENVIRONMENT to "Testing" so
+# AddConfiguration("org") in Program.Main loads this file as the
+# last in the chain (it is optional). It overrides the connection
+# string and SMTP section for the in-memory test host and contains
+# no production secrets.
+!src/Yavsc.Org/appsettings-org.Testing.json
+
+generated/
+*.tmp
+tmp/
+DataDir/
+
+*.tests.trx
+*.tests.html
+
+*.log
+

.vscode/launch.json

@@ -4,6 +4,22 @@
   // Pour plus d'informations, visitez : https://go.microsoft.com/fwlink/?linkid=830387
   "version": "0.2.0",
   "configurations": [
+    {
+      "name": "PostIt Desktop",
+      "type": "dotnet",
+      "request": "launch",
+      "projectPath": "${workspaceFolder}/src/PostIt/PostIt.Desktop/PostIt.Desktop.csproj"
+    },
+    {
+      "name": "PostIt Desktop local",
+      "type": "coreclr",
+      "request": "launch",
+      "program": "${workspaceFolder}/src/PostIt/PostIt.Desktop/bin/Debug/net10.0/PostIt.Desktop.dll",
+      "env": {
+        "POSTIT_SETTINGS_JSON": "/home/paul/Workspace/yavsc/src/PostIt/PostIt/postit-settings.json"
+      },
+      "preLaunchTask": "dotnet: build-postit-desktop"
+    },
     {
       "name": "Android Debug",
       "type": "mono",
@@ -20,10 +36,10 @@
       "port": 55555
     },
     {
-      "name": "API",
+      "name": "Yavsc API",
       "type": "dotnet",
       "request": "launch",
-      "projectPath": "${workspaceFolder}/src/Api/Api.csproj"
+      "projectPath": "${workspaceFolder}/src/Yavsc.Api/Yavsc.Api.csproj"
     },
     {
       "name": "Yavsc Org",
@@ -37,12 +53,7 @@
       "request": "launch",
       "projectPath": "${workspaceFolder}/src/Yavsc.Blogs/Yavsc.Blogs.csproj"
     },
-    {
-      "name": "PostIt Desktop",
-      "type": "dotnet",
-      "request": "launch",
-      "projectPath": "${workspaceFolder}/src/PostIt/PostIt.Desktop/PostIt.Desktop.csproj",
-    },
+
     {
       "name": "Test PostIt.Android launch (Xamarin.UITest)",
       "type": "coreclr",

.vscode/tasks.json

@@ -1,27 +1,13 @@
 {
   "version": "2.0.0",
   "isRoot": true,
-  "problemMatcher": [
-        {
-          "owner": "dotnet",
-          "fileLocation": ["relative", "${workspaceFolder}"],
-          "source": "dotnet",
-          "pattern": {
-            "regexp": "^\\s*(.*)\\((\\d+),(\\d+)\\):\\s+(error|warning) (.*)$",
-            "file": 1,
-            "line": 2,
-            "column": 3,
-            "severity": 4,
-            "code": 5,
-            "message": 6
-          }
-        }
-      ],
+
   "tasks": [
     {
       "label": "run-debug-android",
       "command": "dotnet",
       "type": "shell",
+      "problemMatcher": ["$msCompile"],
       "options": {
         "cwd": "${workspaceFolder}/src/PostIt/PostIt.Android",
         "env": {
@@ -43,11 +29,15 @@
       "label": "build",
       "command": "dotnet",
       "type": "process",
+      "problemMatcher": ["$msCompile"],
       "args": ["build", "/property:GenerateFullPaths=true"],
       "group": "build",
       "isBuildCommand": true,
       "isTestCommand": false,
-      "isBackground": true
+      "isBackground": true,
+      "options": {
+        "cwd": "${workspaceFolder}"
+      }
     },
     {
       "label": "test blogs backend",
@@ -63,6 +53,28 @@
         "isDefault": false
       }
     },
+    {
+      "label": "test api backend (npgsql)",
+      "type": "process",
+      "problemMatcher": "$msCompile",
+      "command": "dotnet",
+      "args": [
+        "test",
+        "Yavsc.Api.Test.csproj",
+        "-v",
+        "minimal"
+      ],
+      "options": {
+        "cwd": "src/Yavsc.Api.Test",
+        "env": {
+          "YAVSC_API_TEST_DB_PROVIDER": "npgsql"
+        }
+      },
+      "group": {
+        "kind": "test",
+        "isDefault": false
+      }
+    },
     {
       "label": "build-webapi",
       "type": "process",
@@ -76,6 +88,22 @@
         "kind": "build"
       },
       "isBackground": true
+    },
+    {
+      "label": "dotnet: build-postit-desktop",
+      "type": "process",
+      "isBuildCommand": true,
+      "isTestCommand": false,
+      "isBackground": true,
+      "command": "dotnet",
+      "problemMatcher": ["$msCompile"],
+      "args": ["build", "/property:GenerateFullPaths=true"],
+      "options": {
+        "cwd": "src/PostIt/PostIt.Desktop"
+      },
+      "group": {
+        "kind": "build"
+      }
     }
   ]
 }

CHANGELOG.md

@@ -1,5 +1,121 @@
 # Changelog
 
+## [1.0.8-rc16] - unstable
+
+Flux de signature et de génération de devis : un devis peut désormais être
+signé par les deux parties (fournisseur et client) puis téléchargé en PDF
+ou TeX depuis PostIt, avec les signatures dessinées en vecteur.
+
+### Added
+
+* [PostIt] Pad de signature sur la page de validation d'un devis : on valide
+  ou on refuse en joignant une signature (côté fournisseur ou client), capturée
+  au format filaire PostIt (strokes) et envoyée sur l'acceptation.
+* [Yavsc.Api] Finalisation de `POST /api/v1/front/query/accept` et `.../reject` :
+  autorisation selon le rôle (fournisseur/client/admin), signature optionnelle
+  persistée sur l'estimate avec horodatage `ProviderValidationDate` /
+  `ClientValidationDate` selon le côté signataire.
+* [Yavsc.Api] `QueryStatus.Accepted` éclaté en `ProAccepted` / `ClientAccepted`
+  pour distinguer l'acceptation de chaque partie.
+* [Yavsc.Api] Endpoints de devis `GET /api/v1/front/query/{id}/estimate.tex` et
+  `estimate.pdf` (clé par id de query). Le flux de génération TeX/PDF est
+  rapatrié de Yavsc.Org vers Yavsc.Api (`TeXHelpers`, `PdfGenerationViewModel`,
+  `BillViewComponent`, modèles Bill/Estimate, `_ViewImports` ; `Program.cs`
+  câble `AddControllersWithViews` + `SiteSettings`).
+* [Yavsc.Api] Signatures du devis dessinées en TikZ vectoriel
+  (`TeXHelpers.SignatureToTikz`) en bas du document, fournisseur et client
+  côte à côte dans deux minipages ; plus de dépendance à un PNG de signature.
+* [Yavsc.Api.Client] `DownloadAsync` sur le client + `GetEstimateTexAsync` /
+  `GetEstimatePdfAsync` ; boutons « Télécharger PDF » / « Télécharger TeX »
+  dans PostIt sur la page de validation du devis et le détail de commande,
+  avec un helper `StorageProvider` d'enregistrement de fichier.
+* [PostIt] La liste des devis se rafraîchit au retour de navigation (pop-back),
+  de sorte qu'un devis validé quitte immédiatement la liste du signataire.
+* [PostIt] Renommage des titres de liste : « Devis en attente de signature
+  fournisseur » / « Devis en attente de signature client ».
+* [Yavsc.Abstract] `SignatureType` déplacé dans `Yavsc.Abstract.Billing`.
+* [CLI] Option `-c configuration-file.json` au lancement.
+* [Tests] `EstimatePdfGenerationTests` : tests unitaires du pipeline
+  signature → TikZ → PDF (devis signé des deux côtés), assertant que le PDF
+  existe au chemin de sortie attendu et que seul le PDF persiste (aux/log
+  nettoyés) ; skip propre si `lualatex` est absent.
+* [README] Dépendances système au runtime pour la génération PDF :
+  `texlive-binaries` (lualatex), `texlive-luatex` (luaotfload),
+  `texlive-pictures` (tikz), `texlive-fonts-extra` (bera).
+
+### Changed
+
+* [Yavsc.Api] `GetOngoingEstimatesAsProvider` filtre désormais sur
+  `ProviderValidationDate` : un devis signé par le fournisseur quitte sa liste
+  « en attente ».
+* [Yavsc.Api] La génération PDF compile via le `lualatex` système, le TeX fourni
+  sur l'entrée standard (`/dev/stdin`), le PDF écrit directement dans le
+  répertoire des factures (`Site.Bills`), les artefacts `.aux`/`.log` nettoyés
+  afin que seul le `.pdf` persiste.
+
+### Fixed
+
+* [Yavsc.Api] `Emergency stop` à la génération PDF : `lualatex` sans argument
+  fichier lit stdin en mode terminal et s'arrête après la première ligne d'un
+  document multi-lignes. Corrigé en passant `/dev/stdin` comme nom de fichier
+  d'entrée — stdin est alors traité comme un fichier régulier et le document
+  multi-lignes compile. C'était la cause racine de l'échec en production, pas
+  `bera` ni `luaotfload` (problèmes réels mais séparés, comblés côté paquets).
+* [Yavsc.Api] `I can't write on file 'estimate-1.log'` : le chemin relatif
+  `Site.Bills` (`"bills"`) était imbriqué quand il servait à la fois de
+  `-output-directory` et de répertoire de travail ; résolu en chemin absolu.
+* [Yavsc.Api] NRE dans `RenderViewToString` (RouteData / `ViewData.Model`
+  nuls) : reconstruit sur le `ControllerContext` du contrôleur ; `IViewEngine`
+  résolu via `IRazorViewEngine` (.NET 10 n'enregistre pas de `IViewEngine`
+  unique).
+* [Yavsc.Api] `Layout = "null"` (chaîne) dans les modèles TeX cherchait
+  `null.cshtml` ; corrigé en `Layout = null` (null C#).
+* [Yavsc.Api] `texi2pdf` (outil Texinfo, inadapté au LaTeX) remplacé par
+  `lualatex`.
+* [Yavsc.Api] Les diagnostics lualatex étaient perdus (écrits dans le `.log`
+  qu'on supprimait) ; stdout/stderr sont désormais capturés dans le message
+  d'erreur, et le `.log` est conservé en cas d'échec.
+
+## [1.0.8-rc15] - unstable
+
+### Added
+
+* [PostIt] Saisie et envoi de pieces jointes sur un billet de blog: le client monte les fichiers en `multipart/form-data` lors du `Save`, ajoute un lien Markdown par piece jointe a l'article, puis re-PUT le billet. Une collection `DraftAttachments` porte les fichiers en cours d'edition.
+* [PostIt] Apercu Markdown dans l'editeur de blogs (integration `MarkdownViewer.Core`) avec bascule edition/preview sur `BlogsPage`.
+* [PostIt] Gestion des devis: page de liste `EstimateListPage` (vues client et prestataire), page d'edition `EstimateEditionPage` avec lignes de devis (`EstimateLineItemViewModel`), et flux de validation d'un devis.
+* [PostIt] Flux des requetes en cours cote prestataire (`ProviderOngoingRequestsPage`) avec tri persistant.
+* [Yavsc.Api] Endpoints devis `GET /api/v1/estimate/asclient` et `GET /api/v1/estimate/asprovider` pour lister les devis en cours selon le role.
+* [Yavsc.Api] Endpoint `GET /api/v1/billing/provider/ongoing` et `POST /api/v1/billing/prosign/{billingCode}/{id}` pour le flux prestataire.
+* [Yavsc.Api.Client] `EstimateApiClient` + DTOs (`EstimateDto`, `EstimateLineDto`) pour le pipeline devis cote client lourd.
+* [Yavsc.Api.Client] Reprise de l'upload de fichiers blog dans `BlogApiClient` (`CreateMultipartContent`, `BlogUploadFile`) — la meme forme filaire que PostIt utilise en production.
+* [Yavsc.Abstract] `FileServerUrlHelpers` pour deriver les URLs publiques des fichiers utilisateur depuis l'autorite OIDC (alignement sur `UserFilesPath`).
+* [Yavsc.Server] `BlogSpotService.AttachFiles` : ecrit les pieces jointes sous la racine des fichiers utilisateur (`{UserFilesDirName}/{user}/blogs/{postId}/{fileName}`).
+* [Yavsc.Blogs] `BlogApiController` accepte `multipart/form-data` (champ `blog` + parts `file`) sur `POST` et `PUT /api/v1/blogspot`, en plus du payload JSON existant.
+* [PostIt] Variable d'environnement `POSTIT_SETTINGS_JSON` pour surcharger les parametres au lancement (utile en CI/test).
+* [Yavsc.Server] Migration EF `fileACL`: `CircleAuthorizationToFile` gagne `OwnerId` + `Access` et un graphe proprieetaire, base du controle d'acces fichier par cercle.
+* [Yavsc.Server] Migration EF `genericEstimate`: `Estimate.Query` passe de `RdvQuery` a `NominativeServiceCommand?` pour supporter des devis non lies a un RDV.
+* [Yavsc.Server] Migrations EF `NominativeServiceCommand` et `AddHairCutQueryLocationId` (localisation de la coupe).
+* [CI] Integration du scan de secrets Gitleaks dans le pipeline Forgejo + `.gitleaksignore`.
+* [Tests] Non-regressions: round-trip multipart blog (`BlogApiTests`, `CreateMultipartContentTests` forme + serveur), `BlogAttachmentLinkTests`, `FileServerUrlHelpersTests`, `EstimateApiControllerTests`, VMs `EstimateList`/`EstimateEdition`/`ProviderOngoingRequests`, `BillingControllerTests` (filtrage par utilisateur), `GetOpenIdConfiguration` contre l'hote de test.
+
+### Changed
+
+* [PostIt] Renommage `MainPage` -> `BlogsPage` (et `PushMainPageAsync` -> `PushBlogsPageAsync`) pour refletter le role de la page.
+* [PostIt] Refacto des `SiteSettings` : reorganisation des parametres, nouvelles valeurs par defaut, et indications plus claires dans les `appsettings`.
+* [Yavsc.Api] `BillingController` ne liste plus que les codes billing de l'utilisateur authentifie (filtre par `UserId`), au lieu de l'ensemble des requetes prestataire.
+* [Yavsc.Api] Mutualisation d'un `YavscMessageSender` partage dans l'hote API (au lieu d'une instance par controller).
+* [Yavsc.Org] La detection du doublon d'email a l'inscription utilise desormais le code erreur generic `DbException` 23505 (fournisseur-agnostique) au lieu de `PostgresException`, pour rester correct en test SQLite.
+* [PostIt] `YavscApiClient` tolere les corps vides (`204 No Content` sur `PUT /blogspot/{id}`) au lieu de lever un `JsonException`.
+* [CI] Le pipeline compile avant les tests, installe les dependances natives, et retire le `ItemGroup.Using Include=Xunit` superflu.
+
+### Fixed
+
+* [PostIt] Suppression d'un faux message d'erreur affiche apres un `PUT /blogspot/{id}` reussi (204 traite comme succes, plus comme une reponse vide invalide).
+* [PostIt] Correction de la creation des liens de pieces jointes (`TryAppendAttachmentLinks`) : segment proprietaire et chemin `blogs/{id}/{fileName}` alignes sur ce que `AttachFiles` ecrit reellement.
+* [Yavsc.Blogs] Correction de l'upload / de la persistance des pieces jointes (`FileSystemHelpers` + `BlogApiController` multipart).
+* [Tests] Stabilisation des suites: seeds billing avec metadonnees d'audit, `GetOpenIdConfiguration_returns_ok` contre l'hote de test, retraits d'assertions abusives, tests SQLite verts.
+* [PostIt] Nettoyage de fichiers temporaires accidentels et ignore des repertoires `tmp` dans le depot.
+
 ## [1.0.8-rc14] - unstable
 
 ### Added
@@ -329,6 +445,8 @@ the ACL now comes along with the article,
   the same user-visible switch without a schema change.
 
 [Unreleased]: https://forgejo.pschneider.fr/notazof/yavsc/compare/HEAD
+[1.0.8-rc16]: https://forgejo.pschneider.fr/notazof/yavsc/compare/1.0.8-rc15...1.0.8-rc16
+[1.0.8-rc15]: https://forgejo.pschneider.fr/notazof/yavsc/compare/1.0.8-rc14...1.0.8-rc15
 [1.0.8-rc1]: https://forgejo.pschneider.fr/notazof/yavsc/compare/1.0.7...1.0.8-rc1
 [1.0.7]: https://forgejo.pschneider.fr/notazof/yavsc/compare/1.0.6...1.0.7
 [1.0.6]: https://forgejo.pschneider.fr/notazof/yavsc/compare/1.0.5...1.0.6

Directory.Build.props

@@ -2,5 +2,16 @@
   <PropertyGroup>
     <RootNamespace>Yavsc</RootNamespace>
     <NoWarn>NU1701, NU1901, NU1902, NU1507</NoWarn>
+    <!-- Disable the StaticWebAssets build cache (the *.dswa.cache.json
+         files written under obj/.../ by DefineStaticWebAssets).
+         ReadOrCreateCache opens them with File.OpenRead and no
+         try/catch, so under parallel solution builds a sharing
+         violation / TOCTOU race on the cache file escapes as
+         MSB4018 and fails the whole build (seen on Yavsc.Blogs
+         during the rc15 solution build). The cache is a pure
+         build-speed optimization; turning it off has no effect on
+         output correctness, only on incremental rebuild speed of
+         the (wwwroot-light) web projects. -->
+    <StaticWebAssetsCacheDefineStaticWebAssetsEnabled>false</StaticWebAssetsCacheDefineStaticWebAssetsEnabled>
   </PropertyGroup>
 </Project>

Directory.Packages.props

@@ -4,53 +4,71 @@
     <IdentityServer8Version>8.1.0-pazofrc007</IdentityServer8Version>
   </PropertyGroup>
   <ItemGroup>
-    <PackageVersion Include="System.Security.Cryptography.Pkcs" Version="10.0.9" />
-
+    <PackageVersion Include="DotMarkdown" Version="0.3.0" />
+    <PackageVersion Include="Markdig" Version="1.3.2" />
+    <PackageVersion Include="System.Security.Cryptography.Pkcs" Version="10.0.12" />
     <PackageVersion Include="HigginsSoft.IdentityServer8" Version="$(IdentityServer8Version)" />
     <PackageVersion Include="HigginsSoft.IdentityServer8.AspNetIdentity" Version="$(IdentityServer8Version)" />
     <PackageVersion Include="HigginsSoft.IdentityServer8.EntityFramework" Version="$(IdentityServer8Version)" />
     <PackageVersion Include="HigginsSoft.IdentityServer8.EntityFramework.Storage" Version="$(IdentityServer8Version)" />
     <PackageVersion Include="HigginsSoft.IdentityServer8.Security" Version="$(IdentityServer8Version)" />
     <PackageVersion Include="HigginsSoft.IdentityServer8.Storage" Version="$(IdentityServer8Version)" />
-
-    <PackageVersion Include="AsciiDocSharp" Version="0.1.0" />
-    <PackageVersion Include="AsciiDocSharp.Converters.Html" Version="0.1.0" />
-
-    <PackageVersion Include="BouncyCastle.Cryptography" Version="2.6.2" />
-
+    <PackageVersion Include="BouncyCastle.Cryptography" Version="2.7.0" />
     <PackageVersion Include="Google.Apis.Compute.v1" Version="1.74.0.4138" />
-
     <PackageVersion Include="Microsoft.AspNetCore.Antiforgery" Version="2.3.11" />
-    <PackageVersion Include="Microsoft.AspNetCore.Authentication.Google" Version="10.0.9" />
-    <PackageVersion Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="10.0.9" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="10.0.9" />
-    <PackageVersion Include="Microsoft.AspNetCore.SignalR" Version="1.2.11" />
-    <PackageVersion Include="Microsoft.EntityFrameworkCore.Tools" Version="10.0.9" />
-    <PackageVersion Include="Microsoft.AspNetCore.Hosting" Version="2.3.11" />
-    <PackageVersion Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="10.0.9" />
-    <PackageVersion Include="Microsoft.AspNetCore.Identity.UI" Version="10.0.9" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.9" />
-    <PackageVersion Include="Microsoft.AspNetCore.Razor" Version="2.3.0" />
-    <PackageVersion Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.9" />
-    <PackageVersion Include="Microsoft.EntityFrameworkCore.InMemory" Version="10.0.9" />
-    <PackageVersion Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.11" />
-    <PackageVersion Include="Microsoft.Extensions.Logging" Version="10.0.9" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.7.0" />
+    <PackageVersion Include="Microsoft.AspNetCore.Authentication.Google" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.AspNetCore.SignalR" Version="1.2.13" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Tools" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.AspNetCore.Hosting" Version="2.3.13" />
+    <PackageVersion Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.AspNetCore.Identity.UI" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.AspNetCore.Razor" Version="2.3.13" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.InMemory" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.Extensions.Logging" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.10.1" />
     <PackageVersion Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="10.0.2" />
-
-    <PackageVersion Include="Swashbuckle.AspNetCore" Version="10.2.2" />
-
+    <PackageVersion Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.IdentityModel.Tokens" Version="8.23.0" />
+    <PackageVersion Include="Microsoft.Extensions.Caching.Memory" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.Extensions.Options" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.AspNetCore.Razor.Language" Version="6.0.36" />
+    <PackageVersion Include="Microsoft.Extensions.CommandLineUtils" Version="1.1.1" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.Extensions.Hosting" Version="10.0.12" />
+    <PackageVersion Include="Swashbuckle.AspNetCore" Version="10.2.3" />
     <PackageVersion Include="coverlet.collector" Version="10.0.1" />
-
     <PackageVersion Include="IdentityModel.OidcClient" Version="6.0.0" />
-
-    <PackageVersion Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="10.0.9" />
-    <PackageVersion Include="Microsoft.IdentityModel.Tokens" Version="8.2.1" />
-    <PackageVersion Include="System.IdentityModel.Tokens.Jwt" Version="8.2.1" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
+    <PackageVersion Include="System.IdentityModel.Tokens.Jwt" Version="8.23.0" />
     <PackageVersion Include="xunit.v3" Version="3.2.2" />
     <PackageVersion Include="xunit.v3.common" Version="3.2.2" />
     <PackageVersion Include="xunit.v3.extensibility.core" Version="3.2.2" />
     <PackageVersion Include="YamlDotNet" Version="18.1.0" />
+
+
+    <PackageVersion Include="Anthropic.SDK" Version="5.10.0" />
+    <PackageVersion Include="Google.Apis.Calendar.v3" Version="1.75.0.4206" />
+    <PackageVersion Include="Magick.NET-Q8-AnyCPU" Version="14.17.1" />
+    <PackageVersion Include="MailKit" Version="4.18.0" />
+    <PackageVersion Include="Microsoft.AspNetCore.Http.Features" Version="5.0.17" />
+    <PackageVersion Include="Microsoft.AspNetCore.StaticFiles" Version="2.3.13" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.SqlServer" Version="10.0.12" />
+
+
+    <PackageVersion Include="Microsoft.Testing.Platform.MSBuild" Version="2.4.1" />
+
+    <PackageVersion Include="MimeKit" Version="4.18.1" />
+    <PackageVersion Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="10.0.3" />
+    <PackageVersion Include="PayPalMerchantSDK" Version="2.16.250" />
+    <PackageVersion Include="pazof.rules" Version="1.1.3" />
+    <PackageVersion Include="RazorEngine.NetCore" Version="3.1.1" />
+
+
+
   </ItemGroup>
 </Project>

Makefile

@@ -13,6 +13,10 @@ all:
 clean:
 	dotnet clean -c $(CONFIG)
 
+brutal_clean:
+	@find -name "obj" -exec rm -rf {} \;
+	@find -name "bin" -exec rm -rf {} \;
+
 src/Yavsc/bin/output/wwwroot:
 	dotnet --project src/Yavsc.Org/Yavsc.Org.csproj publish
 
@@ -48,70 +52,4 @@ docker-build:
 docker-run:
 	docker run -d -p 5000:5000 --name yavsc yavsc
 
-# Crée une branche release/<V> depuis main, met à jour les
-# `<Version>` des .csproj via dotnet-gitversion, et la
-# pousse sur origin.
-#
-# Usage : make release V=1.0.7-rc1
-#
-# Pré-requis : être sur main, working tree clean. La cible
-# vérifie les deux et refuse sinon — elle ne fait JAMAIS
-# de checkout automatique, c'est à l'opérateur de s'être
-# positionné sur la bonne branche au préalable (sinon le
-# bump pourrait partir sur une branche tierce par accident).
-#
-# Notes :
-# - Le nom de branche vient de l'argument V (ex: 1.0.7-rc1
-#   donne release/1.0.7-rc1). C'est une étiquette d'intention,
-#   pas la version assembly.
-# - La version dans les .csproj vient de GitVersion qui la
-#   calcule depuis l'historique git (tag le plus proche +
-#   nombre de commits). C'est la version assembly réelle.
-# - L'ordre (fetch → branche → bump → push) garantit qu'on
-#   part d'un main synchro et qu'on ne pollue pas main avec
-#   le bump (qui vit sur la branche release).
-# - Fail-fast si la branche existe déjà en local ou sur origin.
-release:
-	@if [ -z "$(V)" ]; then \
-		echo "Usage: make release V=<version>"; \
-		echo "  V : version semver (ex. 1.0.7-rc1) — sert à nommer la branche."; \
-		exit 1; \
-	fi
-	@if [ -n "$$(git status --porcelain)" ]; then \
-		echo "Working tree sale, refus de créer une branche release."; \
-		git status --short; \
-		exit 1; \
-	fi
-	@BRANCH="release/$(V)"; \
-	if git show-ref --verify --quiet "refs/heads/$$BRANCH"; then \
-		echo "La branche $$BRANCH existe déjà en local."; \
-		echo "  Pour la supprimer : git branch -D $$BRANCH"; \
-		exit 1; \
-	fi; \
-	if git ls-remote --exit-code --heads origin "$$BRANCH" >/dev/null 2>&1; then \
-		echo "La branche $$BRANCH existe déjà sur origin."; \
-		exit 1; \
-	fi; \
-	echo "==> Fetch + vérification synchro main"; \
-	git fetch origin main; \
-	if ! git merge-base --is-ancestor origin/main HEAD; then \
-		echo "main a avancé plus loin que HEAD. Fais :"; \
-		echo "  git pull --ff-only origin main"; \
-		exit 1; \
-	fi; \
-	echo "==> Création de $$BRANCH depuis main"; \
-	git checkout -b "$$BRANCH"; \
-	echo "==> dotnet-gitversion /updateprojectfiles"; \
-	dotnet-gitversion /updateprojectfiles; \
-	echo "==> Commit du bump"; \
-	git add .; \
-	if git diff --cached --quiet; then \
-		echo "Pas de changements à committer (gitversion n'a produit aucune diff)."; \
-	else \
-		git commit -m "chore(release): bump version via gitversion for $(V)"; \
-	fi; \
-	echo "==> Push de $$BRANCH sur origin"; \
-	git push -u origin "$$BRANCH"; \
-	echo "==> Terminé. Branche $$BRANCH live sur origin."
-
-.PHONY: test release
+.PHONY: test install docker-image docker-build docker-run

README.md

@@ -61,9 +61,40 @@ make test
 
 ### les services et l'API
 
+#### Dépendances système au runtime
+
+La génération des devis et factures en PDF (`/api/v1/front/query/{id}/estimate.pdf`,
+`BillingController` → `BillViewComponent`) compile un source LaTeX via la commande
+système `lualatex` : le TeX est fourni sur l'entrée standard et le PDF est écrit
+directement dans le répertoire des factures (`Site.Bills`). `lualatex` doit donc
+être installé et opérationnel sur l'hôte qui exécute l'API — typiquement le service
+systemd `yavscApi`.
+
+Sous Debian/Ubuntu :
+
+```bash
+sudo apt install texlive-binaries texlive-luatex texlive-pictures texlive-fonts-extra
+```
+
+- `texlive-binaries` fournit l'exécutable `lualatex` (collection basic).
+- `texlive-luatex` fournit les paquets de support chargés au démarrage de lualatex,
+  notamment `luaotfload`. Sans lui, lualatex démarre mais s'arrête sur
+  `module 'luaotfload-main' not found … Emergency stop` et ne produit aucun PDF.
+  (Sur les Debian récents, `luaotfload` a migré de `texlive-latex-extra` vers
+  `texlive-luatex` — avoir `texlive-latex-extra` seul ne suffit plus.)
+- `texlive-pictures` fournit `tikz`/`pgf`, utilisé pour dessiner les signatures
+  du client et du fournisseur en bas du devis (vecteur, pas de PNG).
+- `texlive-fonts-extra` fournit la fonte `bera` chargée par le modèle de devis.
+  Sans elle, lualatex s'arrête sur `! LaTeX Error: File 'bera.sty' not found`
+  (`Emergency stop`, aucun PDF).
+
+Sur un hôte sans `lualatex`, les endpoints PDF renvoient une erreur 500 « PDF
+generation failed » ; l'endpoint TeX (`estimate.tex`) reste utilisable et permet
+de compiler le document hors-ligne.
+
 ### La Prod
 
-`cd srv/Yavsc` : `make pushInProd CONFIGURATION=Release`.
+`cd srv/Yavsc/contrib` : `make reinstall CONFIGURATION=Release APP_INSTALL_ENV=production`.
 
 puis, pour une première installation
 `make install_service`.

contrib/Makefile

@@ -1,23 +1,32 @@
+DESTDIR=
+DOTNET_FRAMEWORK=net10.0
 APP_PROJECT_NAMES=Org Blogs Api
 SLNDIR=..
+APP_INSTALL_ENV=preprod
+APP_INSTALL_PREFIX=preprod-
 
-include $(SLNDIR)/.env
-include .env
+include .$(APP_INSTALL_ENV).env
 
-generated/:
-	@mkdir -p $@
+reinstall: copy-binaries
+	@for project in $(APP_PROJECT_NAMES); do \
+		echo "🚀 Starting $(APP_INSTALL_PREFIX)yavsc$${project}" ; \
+		sudo systemctl start $(APP_INSTALL_PREFIX)yavsc$${project} ; done
+	@echo "💯 backend started"
 
-generated/yavscOrg.service:
-generated/yavscBlogs.service:
-generated/yavscApi.service:
+reinstall-prod:
+	make reinstall APP_INSTALL_ENV= APP_INSTALL_PREFIX= APP_INSTALL_ENV=production
 
-generated/yavsc%.service: generated/ template.service $(SLNDIR)/.env
+generated/$(APP_INSTALL_PREFIX)yavscOrg.service:
+generated/$(APP_INSTALL_PREFIX)yavscBlogs.service:
+generated/$(APP_INSTALL_PREFIX)yavscApi.service:
+
+generated/$(APP_INSTALL_PREFIX)yavsc%.service: generated/ template.service $(SLNDIR)/.env
 	@cat template.service | APP_NAME="$*" \
 	DESTDIR="$(DESTDIR)" \
 	HTTP_HOST="$(HTTP_HOST)" \
 	HTTP_PORT="$*_$(HTTP_PORT)" \
-	BASEAPPDIR="$(BASEAPPDIR)" \
-	APP_SYSLOG_ID="yavsc$*" \
+	APPDIR="$(APPDIR)" \
+	APP_SYSLOG_ID="$(APP_INSTALL_PREFIX)yavsc$*" \
 	POSTGRES_HOST="$(POSTGRES_HOST)" \
 	POSTGRES_PORT="$(POSTGRES_PORT)" \
 	POSTGRES_DB="$(POSTGRES_DB)" \
@@ -34,11 +43,13 @@ generated/yavsc%.service: generated/ template.service $(SLNDIR)/.env
 	envsubst > $@
 	@echo Created service file: $@
 
+generate-service-units: generated/$(APP_INSTALL_PREFIX)yavscOrg.service generated/$(APP_INSTALL_PREFIX)yavscBlogs.service generated/$(APP_INSTALL_PREFIX)yavscApi.service
 
-copy-services: copy-service-Org copy-service-Blogs copy-service-Api
-copy-service-Org: /etc/systemd/system/yavscOrg.service
-copy-service-Blogs: /etc/systemd/system/yavscBlogs.service
-copy-service-Api: /etc/systemd/system/yavscApi.service
+install-service-%: /etc/systemd/system/$(APP_INSTALL_PREFIX)yavsc%.service
+	sudo systemctl daemon-reload
+	sudo systemctl enable $(APP_INSTALL_PREFIX)yavsc$*
+
+install-services: install-service-Org install-service-Blogs install-service-Api
 
 copy-binaries: build_publish_Org build_publish_Blogs build_publish_Api stop-services
 	@for project in $(APP_PROJECT_NAMES); \
@@ -52,39 +63,36 @@ copy-binaries: build_publish_Org build_publish_Blogs build_publish_Api stop-serv
 		rm -f $${BINDIR}/appsettings-$${LCAPI}.json ; \
 		sync ; \
 		ls $${BINDIR}/appsettings* 2>&1 ; \
-		sudo cp -a $${BINDIR}/* $(BASEAPPDIR) ; \
+		sudo cp -a $${BINDIR}/* $(DESTDIR)$(APPDIR) ; \
 	done
-	@sudo chown -R $(USER_AND_GROUP) $(BASEAPPDIR)
+	@sudo chown -R $(USER_AND_GROUP) $(DESTDIR)$(APPDIR)
+	@sync
 
-/etc/systemd/system/yavsc%.service: generated/yavsc%.service
+$(DESTDIR)/etc/systemd/system/$(APP_INSTALL_PREFIX)yavsc%.service:  generated/$(APP_INSTALL_PREFIX)yavsc%.service
 	sudo cp $^ $@
 	sudo chown root:root $@
 
 build_publish_%: clean_publish_dir_%
 	@ASPNETCORE_ENV=$(CONFIGURATION) dotnet publish $(SLNDIR)/src/Yavsc.$*/Yavsc.$*.csproj
 
-build_publish: build_publish_Org build_publish_Blogs build_publish_Api
-
 clean_publish_dir_%:
 	@rm -rf $(SLNDIR)/src/Yavsc.$*/bin/$(CONFIGURATION)/$(DOTNET_FRAMEWORK)/publish
 
-install: build_publish copy-binaries copy-services
+install: copy-binaries copy-services
 	@sudo systemctl daemon-reload
 	@for project in $(APP_PROJECT_NAMES); \
 	do \
-		sudo systemctl enable yavsc$${project} ; \
-		sudo systemctl start yavsc$${project} ; \
+	  echo "🖒 enable $(APP_INSTALL_PREFIX)yavsc$${project}" ; \
+		sudo systemctl enable $(APP_INSTALL_PREFIX)yavsc$${project} ; \
+	  echo "🚀 start $(APP_INSTALL_PREFIX)yavsc$${project}" ; \
+		sudo systemctl start $(APP_INSTALL_PREFIX)yavsc$${project} ; \
 	done
 
-reinstall: copy-binaries
-	@sync
-	@for project in $(APP_PROJECT_NAMES); do \
-		sudo systemctl start yavsc$${project} ; done
-
 stop-services:
 	@for project in $(APP_PROJECT_NAMES); \
 	do \
-		sudo systemctl stop yavsc$${project} ; \
+	  echo "🔥 Stopping $(APP_INSTALL_PREFIX)yavsc$${project}" ; \
+		sudo systemctl stop $(APP_INSTALL_PREFIX)yavsc$${project} ; \
 	done
 
 $(SLNDIR)/src/Yavsc.Org/bin/$(CONFIGURATION)/$(DOTNET_FRAMEWORK)/publish: build_publish
@@ -93,8 +101,19 @@ $(SLNDIR)/src/Yavsc.Api/bin/$(CONFIGURATION)/$(DOTNET_FRAMEWORK)/publish: build_
 
 showConfig:
 	@echo CONFIGURATION: $(CONFIGURATION)
-	@echo BASEAPPDIR: $(BASEAPPDIR)
+	@echo APPDIR: $(APPDIR)
+
+showApiLogs:
+	@sudo journalctl -u yavscApi.service -S "2 min ago" | tee yavscApi.log
+
+showOrgLogs:
+	@sudo journalctl -u yavscOrg.service -S "2 min ago" | tee yavscOrg.log
+
+showBlogsLogs:
+	@sudo journalctl -u yavscBlogs.service -S "2 min ago" | tee yavscBlogs.log
 
 clean:
 	@rm -rf generated
 
+generated/:
+	@mkdir -p $@

contrib/README.md

@@ -1,5 +0,0 @@
-# Read me
-
-## Note aux icones
-
-㝉®🅬⛒⛑🩎🩺🞫🞮🞕🞖🞆🔴🔵🔲🖂🔧🔩🔐🔌💾💼💬💭👿👾🏷🎯🏹🌍🎎💩

contrib/template.service

@@ -10,10 +10,10 @@ RestartSec=5s
 Type=simple
 User=yavsc
 Group=yavsc
-WorkingDirectory=$DESTDIR
-ExecStart=$DESTDIR/Yavsc.$APP_NAME
+WorkingDirectory=$APPDIR
+ExecStart=$APPDIR/Yavsc.$APP_NAME
 Restart=always
-Environment="HOME=$DESTDIR"
+Environment="HOME=$APPDIR"
 Environment="ANTHROPIC_API_KEY=$ANTHROPIC_API_KEY"
 Environment="ANTHROPIC_MAX_TOKENS=$ANTHROPIC_MAX_TOKENS"
 Environment="ASPNETCORE_Environment=$ENV"
@@ -29,8 +29,6 @@ Environment="ASPNETCORE_Smtp__Password=\"$ASPNETCORE_Smtp__Password\""
 
 CapabilityBoundingSet=CAP_NET_BIND_SERVICE
 AmbientCapabilities=CAP_NET_BIND_SERVICE
-StandardOutput=syslog
-StandardError=syslog
 SyslogIdentifier=$APP_SYSLOG_ID
 
 [Install]

contrib/yavsc-org

@@ -1,54 +0,0 @@
-
-
-server {
-    if ($host = yavsc.pschneider.fr) {
-        return 301 https://$host$request_uri;
-    } # managed by Certbot
-
-
-
-    listen        80;
-    server_name yavsc.pschneider.fr;
-    location / {
-		root /srv/www/yavsc/wwwroot;
-        dav_methods  PUT;
-
-        proxy_pass         http://127.0.0.1:3003;
-        proxy_http_version 1.1;
-        proxy_set_header   Upgrade $http_upgrade;
-        proxy_set_header   Connection keep-alive;
-        proxy_set_header   Host $host;
-        proxy_cache_bypass $http_upgrade;
-        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
-        proxy_set_header   X-Forwarded-Proto $scheme;
-    }
-
-}
-
-server {
-	listen 443 ssl;
-	server_name yavsc.pschneider.fr;
-    ssl_certificate /etc/letsencrypt/live/yavsc.pschneider.fr-0001/fullchain.pem; # managed by Certbot
-    ssl_certificate_key /etc/letsencrypt/live/yavsc.pschneider.fr-0001/privkey.pem; # managed by Certbot
-	# Configure the SignalR Endpoint
-	location / {
-		# App server url
-		proxy_pass http://localhost:3003;
-
-		proxy_cache off;
-		# WebSockets were implemented after http/1.0
-		proxy_http_version 1.1;
-
-		# Configuration for ServerSentEvents
-		proxy_buffering off;
-
-		# Configuration for LongPolling or if your KeepAliveInterval is longer than 60 seconds
-		proxy_read_timeout 100s;
-
-		proxy_set_header Host $host;
-        proxy_set_header X-Real-IP $remote_addr;
-		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-		proxy_set_header X-Forwarded-Proto $scheme;
-	}
-}
-

dotnet-tools.json

@@ -1,5 +1,13 @@
 {
   "version": 1,
   "isRoot": true,
-  "tools": {}
+  "tools": {
+    "picket": {
+      "version": "0.2.12",
+      "commands": [
+        "picket"
+      ],
+      "rollForward": false
+    }
+  }
 }

global.json

@@ -0,0 +1,5 @@
+{
+    "test": {
+        "runner": "Microsoft.Testing.Platform"
+    }
+}

src/PostIt/Directory.Packages.props

@@ -1,35 +1,34 @@
 <Project>
-  <Import
-    Project="$([MSBuild]::GetPathOfFileAbove('Directory.Packages.props', '$(MSBuildThisFileDirectory)../'))" />
+  <Import Project="$([MSBuild]::GetPathOfFileAbove('Directory.Packages.props', '$(MSBuildThisFileDirectory)../'))" />
   <!-- PostIt-product-specific versions -->
   <!-- https://learn.microsoft.com/en-us/nuget/consume-packages/central-package-management -->
-    <PropertyGroup>
-        <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
-        <AvaloniaVersionBase>12.1.1</AvaloniaVersionBase>
-    </PropertyGroup>
-    <ItemGroup>
-        <PackageVersion Include="Avalonia" Version="$(AvaloniaVersionBase)" />
-        <PackageVersion Include="Avalonia.Themes.Fluent" Version="$(AvaloniaVersionBase)" />
-        <PackageVersion Include="Avalonia.Desktop" Version="$(AvaloniaVersionBase)" />
-        <PackageVersion Include="Avalonia.Browser" Version="$(AvaloniaVersionBase)" />
-        <PackageVersion Include="Avalonia.Android" Version="$(AvaloniaVersionBase)" />
-        <PackageVersion Include="Avalonia.Headless" Version="$(AvaloniaVersionBase)" />
-        <PackageVersion Include="Avalonia.Headless.Xunit" Version="$(AvaloniaVersionBase)" />
-        <PackageVersion Include="Avalonia.Fonts.Inter" Version="$(AvaloniaVersionBase)" />
-        <PackageVersion Include="Mapsui" Version="5.1.0" />
-        <PackageVersion Include="Mapsui.Avalonia12" Version="5.1.0" />
-
-        <PackageVersion Include="Material.Avalonia" Version="3.19.0" />
-        <PackageVersion Include="AvaloniaUI.DiagnosticsSupport" Version="2.2.3" />
-        <PackageVersion Include="CommunityToolkit.Mvvm" Version="8.4.2" />
-
-        <PackageVersion Include="Xamarin.AndroidX.Browser" Version="1.10.0.1" />
-        <PackageVersion Include="Xamarin.AndroidX.Core.SplashScreen" Version="1.2.0" />
-        <PackageVersion Include="Xamarin.AndroidX.Lifecycle.Runtime" Version="2.10.0.1" />
-        <PackageVersion Include="Xamarin.AndroidX.Lifecycle.Common" Version="2.10.0.1" />
-        <PackageVersion Include="Xamarin.UITest" Version="4.4.2" />
-
-        <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.11" />
-
-    </ItemGroup>
-</Project>
+  <PropertyGroup>
+    <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
+    <AvaloniaVersionBase>12.1.2</AvaloniaVersionBase>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageVersion Include="Avalonia" Version="$(AvaloniaVersionBase)" />
+    <PackageVersion Include="Avalonia.AvaloniaEdit" Version="12.0.0" />
+    <PackageVersion Include="Avalonia.Themes.Fluent" Version="$(AvaloniaVersionBase)" />
+    <PackageVersion Include="Avalonia.Desktop" Version="$(AvaloniaVersionBase)" />
+    <PackageVersion Include="Avalonia.Browser" Version="$(AvaloniaVersionBase)" />
+    <PackageVersion Include="Avalonia.Android" Version="$(AvaloniaVersionBase)" />
+    <PackageVersion Include="Avalonia.Headless" Version="12.1.2" />
+    <PackageVersion Include="Avalonia.Headless.Xunit" Version="$(AvaloniaVersionBase)" />
+    <PackageVersion Include="Avalonia.Fonts.Inter" Version="$(AvaloniaVersionBase)" />
+    <PackageVersion Include="Mapsui" Version="5.1.0" />
+    <PackageVersion Include="Mapsui.Avalonia12" Version="5.1.0" />
+    <PackageVersion Include="MarkdownViewer.Core" Version="1.0.5" />
+    <PackageVersion Include="Material.Avalonia" Version="3.20.0" />
+    <PackageVersion Include="AvaloniaUI.DiagnosticsSupport" Version="2.2.3" />
+    <PackageVersion Include="CommunityToolkit.Mvvm" Version="8.4.2" />
+    <PackageVersion Include="Mono.Options" Version="6.12.0.148" />
+    <PackageVersion Include="Xamarin.AndroidX.Browser" Version="1.10.0.1" />
+    <PackageVersion Include="Xamarin.AndroidX.Core.SplashScreen" Version="1.2.0.3" />
+    <PackageVersion Include="Xamarin.AndroidX.Lifecycle.Runtime" Version="2.11.0.1" />
+    <PackageVersion Include="Xamarin.AndroidX.Lifecycle.Common" Version="2.11.0.1" />
+    <PackageVersion Include="Xamarin.AndroidX.Lifecycle.Process" Version="2.11.0.1" />
+    <PackageVersion Include="Xamarin.UITest" Version="4.4.2" />
+    <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.12" />
+  </ItemGroup>
+</Project>

src/PostIt/PostIt.Android/PostIt.Android.csproj

@@ -11,8 +11,8 @@
     <AndroidEnableProfiledAot>false</AndroidEnableProfiledAot>
     <AssemblyVersion>1.1.0.0</AssemblyVersion>
     <FileVersion>1.1.0.0</FileVersion>
-    <InformationalVersion>1.1.0-beta.1+183.Branch.release-1.0.8-rc8.Sha.6cff3db32ecf72c0d2d430b7002fa7816a34e070</InformationalVersion>
-    <Version>1.1.0-beta.1</Version>
+    <InformationalVersion>1.1.0-estimate.1+343.Branch.feature-estimate.Sha.ba40698cc9562f0f4ad2dcad4dd20e638c05b07d</InformationalVersion>
+    <Version>1.1.0-estimate.1</Version>
   </PropertyGroup>
   <ItemGroup>
     <AndroidResource Include="Icon.png">

src/PostIt/PostIt.Browser/PostIt.Browser.csproj

@@ -6,8 +6,8 @@
     <Nullable>enable</Nullable>
     <AssemblyVersion>1.1.0.0</AssemblyVersion>
     <FileVersion>1.1.0.0</FileVersion>
-    <InformationalVersion>1.1.0-beta.1+183.Branch.release-1.0.8-rc8.Sha.6cff3db32ecf72c0d2d430b7002fa7816a34e070</InformationalVersion>
-    <Version>1.1.0-beta.1</Version>
+    <InformationalVersion>1.1.0-estimate.1+343.Branch.feature-estimate.Sha.ba40698cc9562f0f4ad2dcad4dd20e638c05b07d</InformationalVersion>
+    <Version>1.1.0-estimate.1</Version>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Avalonia.Browser" />

src/PostIt/PostIt.Desktop/PostIt.Desktop.csproj

@@ -7,8 +7,8 @@
     <Nullable>enable</Nullable>
     <AssemblyVersion>1.1.0.0</AssemblyVersion>
     <FileVersion>1.1.0.0</FileVersion>
-    <InformationalVersion>1.1.0-beta.1+183.Branch.release-1.0.8-rc8.Sha.6cff3db32ecf72c0d2d430b7002fa7816a34e070</InformationalVersion>
-    <Version>1.1.0-beta.1</Version>
+    <InformationalVersion>1.1.0-estimate.1+343.Branch.feature-estimate.Sha.ba40698cc9562f0f4ad2dcad4dd20e638c05b07d</InformationalVersion>
+    <Version>1.1.0-estimate.1</Version>
   </PropertyGroup>
   <PropertyGroup>
     <ApplicationManifest>app.manifest</ApplicationManifest>

src/PostIt/PostIt.Desktop/Program.cs

@@ -12,6 +12,8 @@ sealed class Program
     [STAThread]
     public static void Main(string[] args)
     {
+        CLIOptionHandler.HandleArgs(args);
+
         // Short-circuit 2nd-instance launches (OS handing us the
         // postit://callback URL) BEFORE Avalonia spins up a window.
         // If we let Avalonia initialise, the new MainWindow flashes

src/PostIt/PostIt.Tests/ActivitiesPageViewModelTests.cs

@@ -162,6 +162,12 @@ public class ActivitiesPageViewModelTests
             return Task.CompletedTask;
         }
 
+        public Task<T> CallAsync<T>(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync<T>(method, path, (object?)null, ct);
+
+        public Task CallAsync(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync(method, path, (object?)null, ct);
+
         public ValueTask DisposeAsync() => ValueTask.CompletedTask;
     }
 }

src/PostIt/PostIt.Tests/BillingCommandPageViewModelTests.cs

@@ -352,6 +352,12 @@ public class BillingCommandPageViewModelTests
             return Task.CompletedTask;
         }
 
+        public Task<T> CallAsync<T>(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync<T>(method, path, (object?)null, ct);
+
+        public Task CallAsync(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync(method, path, (object?)null, ct);
+
         public ValueTask DisposeAsync() => ValueTask.CompletedTask;
     }
 }

src/PostIt/PostIt.Tests/BillingQueriesPageViewModelTests.cs

@@ -45,10 +45,8 @@ public class BillingQueriesPageViewModelTests
         Assert.Equal(2, vm.Queries.Count);
         Assert.All(vm.Queries, q => Assert.DoesNotContain("Rejected", q.StatusLabel, StringComparison.OrdinalIgnoreCase));
         Assert.Contains("lecture seule", vm.StatusMessage, StringComparison.OrdinalIgnoreCase);
-        Assert.False(vm.CanOpenDetails);
 
-        vm.SelectedQuery = vm.Queries[0];
-        Assert.False(vm.OpenSelectedQueryCommand.CanExecute(null));
+        Assert.True(vm.Queries.Count > 0);
     }
 
     private sealed class StubBillingApi : IYavscApiClient
@@ -129,6 +127,12 @@ public class BillingQueriesPageViewModelTests
             return Task.CompletedTask;
         }
 
+        public Task<T> CallAsync<T>(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync<T>(method, path, (object?)null, ct);
+
+        public Task CallAsync(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync(method, path, (object?)null, ct);
+
         public ValueTask DisposeAsync() => ValueTask.CompletedTask;
     }
 }

src/PostIt/PostIt.Tests/BlogApiTestFakes.cs

@@ -62,4 +62,17 @@ internal sealed class RecordingYavscApiClient : YavscApiClient
             });
         return Task.FromResult(default(T)!);
     }
+
+    /// <summary>Multipart overload: BlogApiClient routes
+    /// Create/UpdatePostAsync with attachments through here.
+    /// Without this override the call would fall through to the
+    /// base <see cref="YavscApiClient"/> and attempt a real HTTP
+    /// round-trip against the stub authority. The body is a
+    /// factory, so we record the delegate itself; tests that
+    /// care about the multipart shape invoke it.</summary>
+    public override Task<T> CallAsync<T>(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+    {
+        _recorder.Calls.Add((method, path, contentFactory));
+        return Task.FromResult(default(T)!);
+    }
 }

src/PostIt/PostIt.Tests/BlogAttachmentLinkTests.cs

@@ -0,0 +1,79 @@
+using Yavsc.Blogspot;
+using Yavsc.Api.Client;
+using PostIt.ViewModels;
+
+namespace PostIt.Tests;
+
+/// <summary>
+/// Pins the markdown link that <see cref="BlogsViewModel.SaveAsync"/>
+/// appends to the article after a successful attachment upload.
+///
+/// <para>The link must be an absolute URL derived from the OIDC
+/// authority via <c>FileServerUrlHelpers.GetUserFilesUri</c>
+/// (Yavsc.Abstract): the <c>/files</c> file server is hosted by
+/// Yavsc.Org — the IdP — not by the blogs API host, so a link
+/// built from <c>BlogsApiUrl</c> (or left relative) 404s when the
+/// reader opens the post. The regression this guards: a generated
+/// link of the shape <c>/files/{user}/blogs/{id}/{name}</c>
+/// (relative, authority-less) instead of
+/// <c>https://{authority}/files/{user}/blogs/{id}/{name}</c>.</para>
+/// </summary>
+public class BlogAttachmentLinkTests
+{
+    [Fact]
+    public async Task Save_with_attachment_appends_absolute_link_derived_from_the_oidc_authority()
+    {
+        const string authority = "https://idp.example.test";
+
+        var recorder = new CallRecorder();
+        var api = new RecordingYavscApiClient(recorder);
+        var blog = new BlogApiClient(api, "https://blogs.example.test/api/v1/");
+        var settings = new Settings
+        {
+            Authentication = new AuthenticationSettings
+            {
+                Authority = authority,
+                ClientId = "stub",
+                Scopes = new[] { "openid" },
+            },
+        };
+        var vm = new BlogsViewModel(blog, settings);
+
+        // Update branch: an existing post is selected, the user
+        // edits the buffers and attaches a file.
+        vm.SelectedPost = new BlogPostDto
+        {
+            Id = 42,
+            AuthorId = "tester",
+            Title = "Avant",
+            Article = "Contenu initial.",
+            DateCreated = DateTime.UtcNow,
+            DateModified = DateTime.UtcNow,
+        };
+        vm.DraftTitle = "Après";
+        vm.DraftArticle = "Contenu modifié.";
+        vm.DraftAttachments.Add(new BlogUploadFile(
+            "note.txt",
+            System.Text.Encoding.UTF8.GetBytes("payload test"),
+            "text/plain"));
+
+        await vm.SaveAsync();
+
+        // The update branch issues two PUTs: the multipart one
+        // carrying the file, then — because TryAppendAttachmentLinks
+        // appended a link — a JSON one carrying the final article.
+        var linkPut = recorder.Calls.LastOrDefault(
+            c => c.method == HttpMethod.Put);
+        Assert.NotEqual(default, linkPut);
+        var sent = Assert.IsType<System.Func<HttpContent>>(linkPut.body);
+        var multipartContent = Assert.IsType<MultipartFormDataContent>(sent());
+
+        var expectedUrl = $"{authority}/files/tester/blogs/42/note.txt";
+        var sentStringContent =  multipartContent.First() as StringContent ;
+
+        var sentString = await sentStringContent.ReadAsStringAsync(TestContext.Current.CancellationToken);
+        Assert.Contains($"- [note.txt]({expectedUrl})", sentString);
+        // The regression shape: a relative, authority-less link.
+        Assert.DoesNotContain("](/files/", sentString);
+    }
+}

src/PostIt/PostIt.Tests/EstimateEditionPageViewModelTests.cs

@@ -0,0 +1,270 @@
+using System.Net.Http;
+using PostIt.ViewModels;
+using Yavsc;
+using Yavsc.Api.Client;
+
+namespace PostIt.Tests;
+
+public class EstimateEditionPageViewModelTests
+{
+    private static BillingQuerySummaryDto SampleQuery() => new()
+    {
+        Id = 42,
+        BillingCode = "Brush",
+        ActivityCode = "hair",
+        PerformerId = "perf-1",
+        ClientId = "cli-1",
+        Status = QueryStatus.InProgress,
+        Description = "Coupe simple",
+        EventDate = new DateTime(2026, 9, 12, 10, 0, 0, DateTimeKind.Utc),
+    };
+
+    private static EstimateEditionPageViewModel CreateViewModel(StubEstimateApi api, BillingQuerySummaryDto? query = null)
+    {
+        var client = new EstimateApiClient(api, "https://business.example/api/v1/");
+        return new EstimateEditionPageViewModel(query ?? SampleQuery(), client);
+    }
+
+    [Fact]
+    public void Constructor_prefills_description_and_adds_a_first_line()
+    {
+        var api = new StubEstimateApi();
+        var vm = CreateViewModel(api);
+
+        Assert.Equal("Coupe simple", vm.EstimateDescription);
+        Assert.Single(vm.Lines);
+        Assert.Same(vm.Lines[0], vm.SelectedLine);
+        Assert.Contains("#42", vm.ContextLabel);
+        Assert.Contains("cli-1", vm.ContextLabel);
+    }
+
+    [Fact]
+    public void AddLine_appends_and_selects_the_new_line()
+    {
+        var api = new StubEstimateApi();
+        var vm = CreateViewModel(api);
+
+        vm.AddLineCommand.Execute(null);
+
+        Assert.Equal(2, vm.Lines.Count);
+        Assert.Same(vm.Lines[1], vm.SelectedLine);
+    }
+
+    [Fact]
+    public void RemoveLine_removes_the_selected_line()
+    {
+        var api = new StubEstimateApi();
+        var vm = CreateViewModel(api);
+        var first = vm.Lines[0];
+
+        vm.RemoveLineCommand.Execute(null);
+
+        Assert.Empty(vm.Lines);
+        Assert.Null(vm.SelectedLine);
+        Assert.False(vm.RemoveLineCommand.CanExecute(null));
+        Assert.DoesNotContain(first, vm.Lines);
+    }
+
+    [Fact]
+    public void Total_sums_line_totals_and_tracks_edits()
+    {
+        var api = new StubEstimateApi();
+        var vm = CreateViewModel(api);
+
+        vm.Lines[0].Count = 2;
+        vm.Lines[0].UnitaryCost = 15.5m;
+
+        Assert.Equal(31m, vm.Total);
+        Assert.Equal($"{31m:0.00} EUR", vm.TotalLabel);
+
+        vm.AddLineCommand.Execute(null);
+        vm.Lines[1].Count = 1;
+        vm.Lines[1].UnitaryCost = 9m;
+
+        Assert.Equal(40m, vm.Total);
+    }
+
+    [Fact]
+    public async Task Send_without_title_warns_and_does_not_post()
+    {
+        var api = new StubEstimateApi();
+        var vm = CreateViewModel(api);
+        vm.Lines[0].Name = "Coupe";
+        vm.Lines[0].Description = "Coupe simple";
+        vm.Lines[0].UnitaryCost = 25m;
+
+        await vm.SendCommand.ExecuteAsync(null);
+
+        Assert.Null(api.LastBody);
+        Assert.Equal(StatusSeverity.Warning, vm.ActionStatus.Severity);
+        Assert.Contains("titre", vm.ActionStatus.Message);
+    }
+
+    [Fact]
+    public async Task Send_without_any_line_warns_and_does_not_post()
+    {
+        var api = new StubEstimateApi();
+        var vm = CreateViewModel(api);
+        vm.EstimateTitle = "Devis coupe";
+        vm.Lines.Clear();
+
+        await vm.SendCommand.ExecuteAsync(null);
+
+        Assert.Null(api.LastBody);
+        Assert.Equal(StatusSeverity.Warning, vm.ActionStatus.Severity);
+        Assert.Contains("ligne", vm.ActionStatus.Message);
+    }
+
+    [Fact]
+    public async Task Send_with_a_blank_line_name_warns_and_does_not_post()
+    {
+        var api = new StubEstimateApi();
+        var vm = CreateViewModel(api);
+        vm.EstimateTitle = "Devis coupe";
+        vm.Lines[0].Description = "Oubli du nom";
+
+        await vm.SendCommand.ExecuteAsync(null);
+
+        Assert.Null(api.LastBody);
+        Assert.Equal(StatusSeverity.Warning, vm.ActionStatus.Severity);
+        Assert.Contains("nom", vm.ActionStatus.Message);
+    }
+
+    [Fact]
+    public async Task Send_posts_the_estimate_payload_to_the_estimate_route()
+    {
+        var api = new StubEstimateApi();
+        var vm = CreateViewModel(api);
+        vm.EstimateTitle = "  Devis coupe  ";
+        vm.Lines[0].Name = "Coupe";
+        vm.Lines[0].Description = "Coupe simple";
+        vm.Lines[0].Count = 2.4m;
+        vm.Lines[0].UnitaryCost = 25m;
+
+        await vm.SendCommand.ExecuteAsync(null);
+
+        Assert.Equal("https://business.example/api/v1/estimate", api.LastPath);
+        Assert.Equal(HttpMethod.Post, api.LastMethod);
+
+        var payload = Assert.IsType<EstimateDto>(api.LastBody);
+        Assert.Equal(42, payload.CommandId);
+        Assert.Equal("cli-1", payload.ClientId);
+        Assert.Equal("Brush", payload.CommandType);
+        Assert.Equal("Devis coupe", payload.Title);
+        Assert.Equal("Coupe simple", payload.Description);
+        Assert.Empty(payload.AttachedFiles);
+        Assert.Empty(payload.AttachedGraphics);
+
+        var line = Assert.Single(payload.Bill);
+        Assert.Equal("Coupe", line.Name);
+        Assert.Equal(2, line.Count);
+        Assert.Equal(25m, line.UnitaryCost);
+        Assert.Equal("EUR", line.Currency);
+    }
+
+    [Fact]
+    public async Task Send_marks_the_page_as_sent_and_disables_resend()
+    {
+        var api = new StubEstimateApi();
+        var vm = CreateViewModel(api);
+        vm.EstimateTitle = "Devis coupe";
+        vm.Lines[0].Name = "Coupe";
+        vm.Lines[0].Description = "Coupe simple";
+        vm.Lines[0].UnitaryCost = 25m;
+
+        await vm.SendCommand.ExecuteAsync(null);
+
+        Assert.True(vm.HasSent);
+        Assert.False(vm.SendCommand.CanExecute(null));
+        Assert.Equal("Devis envoyé", vm.SendLabel);
+        Assert.Equal(StatusSeverity.Info, vm.ActionStatus.Severity);
+        Assert.Contains("#7", vm.ActionStatus.Message);
+    }
+
+    [Fact]
+    public async Task Send_surfaces_server_errors_as_error_status()
+    {
+        var api = new StubEstimateApi { Failure = new HttpRequestException("boom", null, System.Net.HttpStatusCode.InternalServerError) };
+        var vm = CreateViewModel(api);
+        vm.EstimateTitle = "Devis coupe";
+        vm.Lines[0].Name = "Coupe";
+        vm.Lines[0].Description = "Coupe simple";
+
+        await vm.SendCommand.ExecuteAsync(null);
+
+        Assert.False(vm.HasSent);
+        Assert.Equal(StatusSeverity.Error, vm.ActionStatus.Severity);
+        Assert.True(vm.SendCommand.CanExecute(null));
+    }
+
+    [Fact]
+    public async Task Send_accepts_negative_amounts_for_discount_lines()
+    {
+        var api = new StubEstimateApi();
+        var vm = CreateViewModel(api);
+        vm.EstimateTitle = "Devis avec remise";
+        vm.Lines[0].Name = "Coupe";
+        vm.Lines[0].Description = "Coupe simple";
+        vm.Lines[0].UnitaryCost = 25m;
+
+        vm.AddLineCommand.Execute(null);
+        vm.Lines[1].Name = "Remise fidélité";
+        vm.Lines[1].Description = "Remise client régulier";
+        vm.Lines[1].UnitaryCost = -5m;
+
+        Assert.Equal(20m, vm.Total);
+
+        await vm.SendCommand.ExecuteAsync(null);
+
+        var payload = Assert.IsType<EstimateDto>(api.LastBody);
+        Assert.Equal(2, payload.Bill.Count);
+        Assert.Equal(-5m, payload.Bill[1].UnitaryCost);
+        Assert.True(vm.HasSent);
+    }
+
+    private sealed class StubEstimateApi : IYavscApiClient
+    {
+        public HttpClient Http { get; } = new();
+        public string? LastPath { get; private set; }
+        public HttpMethod? LastMethod { get; private set; }
+        public object? LastBody { get; private set; }
+        public Exception? Failure { get; init; }
+
+        public Task<T> CallAsync<T>(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            LastMethod = method;
+            LastPath = path;
+            LastBody = body;
+
+            if (Failure is not null)
+            {
+                throw Failure;
+            }
+
+            if (typeof(T) == typeof(EstimateCreatedDto))
+            {
+                var payload = (EstimateDto)body!;
+                var created = new EstimateCreatedDto { Id = 7, Bill = payload.Bill };
+                return Task.FromResult((T)(object)created);
+            }
+
+            return Task.FromResult(default(T)!);
+        }
+
+        public Task CallAsync(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            LastMethod = method;
+            LastPath = path;
+            LastBody = body;
+            return Task.CompletedTask;
+        }
+
+        public Task<T> CallAsync<T>(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync<T>(method, path, (object?)null, ct);
+
+        public Task CallAsync(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync(method, path, (object?)null, ct);
+
+        public ValueTask DisposeAsync() => ValueTask.CompletedTask;
+    }
+}

src/PostIt/PostIt.Tests/EstimateListPageViewModelTests.cs

@@ -0,0 +1,138 @@
+using System.Net.Http;
+using PostIt.ViewModels;
+using Yavsc.Api.Client;
+
+namespace PostIt.Tests;
+
+public class EstimateListPageViewModelTests
+{
+    [Fact]
+    public async Task Client_perspective_calls_asclient_endpoint()
+    {
+        var api = new StubEstimateListApi();
+        var client = new EstimateApiClient(api, "https://business.example/api/v1/");
+        var front = new FrontOfficeApiClient(api, "https://business.example/api/v1/");
+        var vm = new EstimateListPageViewModel(client, EstimateListPerspective.Client, front);
+
+        await vm.InitializeAsync();
+
+        Assert.Contains("https://business.example/api/v1/estimate/asclient", api.Paths);
+        Assert.Equal("Devis en attente de signature client", vm.Title);
+        Assert.Equal(2, vm.Estimates.Count);
+        // Most recent first
+        Assert.Equal(2, vm.Estimates[0].Id);
+        Assert.Equal(1, vm.Estimates[1].Id);
+    }
+
+    [Fact]
+    public async Task Provider_perspective_calls_asprovider_endpoint()
+    {
+        var api = new StubEstimateListApi();
+        var client = new EstimateApiClient(api, "https://business.example/api/v1/");
+        var front = new FrontOfficeApiClient(api, "https://business.example/api/v1/");
+        var vm = new EstimateListPageViewModel(client, EstimateListPerspective.Provider, front);
+
+        await vm.InitializeAsync();
+
+        Assert.Contains("https://business.example/api/v1/estimate/asprovider", api.Paths);
+        Assert.Equal("Devis en attente de signature fournisseur", vm.Title);
+        Assert.Equal(2, vm.Estimates.Count);
+    }
+
+    [Fact]
+    public async Task FilterText_filters_by_title_and_counterpart()
+    {
+        var api = new StubEstimateListApi();
+        var client = new EstimateApiClient(api, "https://business.example/api/v1/");
+        var front = new FrontOfficeApiClient(api, "https://business.example/api/v1/");
+        var vm = new EstimateListPageViewModel(client, EstimateListPerspective.Provider, front);
+
+        await vm.InitializeAsync();
+
+        vm.FilterText = "plomberie";
+        Assert.Single(vm.Estimates);
+        Assert.Equal(1, vm.Estimates[0].Id);
+
+        vm.FilterText = "BOB";
+        Assert.Single(vm.Estimates);
+        Assert.Equal("bob", vm.Estimates[0].ClientId);
+
+        vm.FilterText = string.Empty;
+        Assert.Equal(2, vm.Estimates.Count);
+    }
+
+    [Fact]
+    public async Task Empty_result_sets_an_info_status()
+    {
+        var api = new StubEstimateListApi { Empty = true };
+        var client = new EstimateApiClient(api, "https://business.example/api/v1/");
+        var front = new FrontOfficeApiClient(api, "https://business.example/api/v1/");
+        var vm = new EstimateListPageViewModel(client, EstimateListPerspective.Client, front);
+
+        await vm.InitializeAsync();
+
+        Assert.Empty(vm.Estimates);
+        Assert.Contains("Aucun devis", vm.StatusMessage);
+    }
+
+    private sealed class StubEstimateListApi : IYavscApiClient
+    {
+        public HttpClient Http { get; } = new();
+        public List<string> Paths { get; } = new();
+        public bool Empty { get; init; }
+
+        public Task<T> CallAsync<T>(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            Paths.Add(path);
+
+            if (typeof(T) == typeof(List<EstimateDto>))
+            {
+                var items = Empty
+                    ? new List<EstimateDto>()
+                    : new List<EstimateDto>
+                    {
+                        new()
+                        {
+                            Id = 1,
+                            Title = "Devis plomberie",
+                            Description = "Réparation fuite",
+                            ClientId = "bob",
+                            OwnerId = "alice",
+                            CommandType = "Rdv",
+                            Bill = new List<EstimateLineDto>
+                            {
+                                new() { Name = "Main d'œuvre", Description = "Intervention", Count = 1, UnitaryCost = 80m },
+                            },
+                        },
+                        new()
+                        {
+                            Id = 2,
+                            Title = "Devis électricité",
+                            Description = "Mise aux normes",
+                            ClientId = "carol",
+                            OwnerId = "alice",
+                            CommandType = "Rdv",
+                            Bill = new List<EstimateLineDto>(),
+                        },
+                    };
+                return Task.FromResult((T)(object)items);
+            }
+
+            return Task.FromResult(default(T)!);
+        }
+
+        public Task CallAsync(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            Paths.Add(path);
+            return Task.CompletedTask;
+        }
+
+        public Task<T> CallAsync<T>(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync<T>(method, path, (object?)null, ct);
+
+        public Task CallAsync(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync(method, path, (object?)null, ct);
+
+        public ValueTask DisposeAsync() => ValueTask.CompletedTask;
+    }
+}

src/PostIt/PostIt.Tests/EstimateValidationPageViewModelTests.cs

@@ -0,0 +1,255 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using PostIt.Controls;
+using PostIt.ViewModels;
+using Yavsc.Api.Client;
+using Yavsc.Models.Billing;
+
+namespace PostIt.Tests;
+
+/// <summary>
+/// Verifies <see cref="EstimateValidationPageViewModel"/> wires the two
+/// signature pads (provider + client) into the right
+/// <see cref="FrontOfficeApiClient"/> call. The view (XAML, rendering)
+/// is not tested here; the VM is driven through the same
+/// <see cref="SignaturePadControl"/> test hooks the signature tests use,
+/// and the API client through a recording fake
+/// <see cref="IYavscApiClient"/>. The test host's
+/// <c>TestApp</c> makes <c>GoBackAsync</c> a no-op, so the success paths
+/// run to completion without navigation side effects.
+/// </summary>
+public class EstimateValidationPageViewModelTests
+{
+    private static EstimateDto SampleEstimate(long? commandId = 42) => new()
+    {
+        Id = 7,
+        CommandId = commandId,
+        CommandType = "Rdv",
+        Title = "Devis plomberie",
+        Description = "Réparation",
+        ClientId = "bob",
+        OwnerId = "alice",
+    };
+
+    private static void DrawOneStroke(SignaturePadControl pad)
+    {
+        pad.AppendPointForTest(100, 200);
+        pad.AppendPointForTest(300, 400);
+        pad.SealStrokeForTest();
+    }
+
+    [Fact]
+    public async Task Validate_calls_accept_with_strokes_and_command_id()
+    {
+        var api = new RecordingApi();
+        var front = new FrontOfficeApiClient(api, "https://business.example/api/v1/");
+        var vm = new EstimateValidationPageViewModel(
+            SampleEstimate(), EstimateListPerspective.Provider, front);
+
+        var proPad = new SignaturePadControl();
+        var clientPad = new SignaturePadControl();
+        vm.Attach(proPad, clientPad);
+        DrawOneStroke(proPad); // provider signs on their writable pad
+
+        await vm.ValidateAsync();
+
+        Assert.Equal(HttpMethod.Post, api.LastMethod);
+        Assert.Contains("front/query/accept", api.LastPath);
+        Assert.Contains("billingCode=Rdv", api.LastPath);
+        Assert.Contains("queryId=42", api.LastPath);
+        var body = Assert.IsType<QueryAcceptanceRequestDto>(api.LastBody);
+        Assert.NotNull(body.Strokes);
+        Assert.NotEmpty(body.Strokes);
+        Assert.Equal(10_000, body.CoordinateMax);
+        // The provider perspective declares the Pro side, so the
+        // server stores the signature under the provider's author
+        // regardless of role inference.
+        Assert.Equal(SignatureType.Pro, body.SignatureType);
+    }
+
+    [Fact]
+    public async Task Validate_from_client_perspective_declares_client_side()
+    {
+        var api = new RecordingApi();
+        var front = new FrontOfficeApiClient(api, "https://business.example/api/v1/");
+        var vm = new EstimateValidationPageViewModel(
+            SampleEstimate(), EstimateListPerspective.Client, front);
+
+        var cliPad = new SignaturePadControl();
+        vm.Attach(new SignaturePadControl(), cliPad);
+        DrawOneStroke(cliPad); // client signs on their writable pad
+
+        await vm.ValidateAsync();
+
+        var body = Assert.IsType<QueryAcceptanceRequestDto>(api.LastBody);
+        Assert.Equal(SignatureType.Client, body.SignatureType); // Client side
+    }
+
+    [Fact]
+    public async Task Reject_calls_reject_endpoint_with_no_body()
+    {
+        var api = new RecordingApi();
+        var front = new FrontOfficeApiClient(api, "https://business.example/api/v1/");
+        var vm = new EstimateValidationPageViewModel(
+            SampleEstimate(), EstimateListPerspective.Client, front);
+
+        vm.Attach(new SignaturePadControl(), new SignaturePadControl());
+
+        await vm.RejectAsync();
+
+        Assert.Equal(HttpMethod.Post, api.LastMethod);
+        Assert.Contains("front/query/reject", api.LastPath);
+        Assert.Contains("queryId=42", api.LastPath);
+        Assert.Null(api.LastBody);
+    }
+
+    [Fact]
+    public async Task Validate_without_signature_warns_and_does_not_call()
+    {
+        var api = new RecordingApi();
+        var front = new FrontOfficeApiClient(api, "https://business.example/api/v1/");
+        var vm = new EstimateValidationPageViewModel(
+            SampleEstimate(), EstimateListPerspective.Provider, front);
+
+        vm.Attach(new SignaturePadControl(), new SignaturePadControl()); // empty pads
+
+        await vm.ValidateAsync(); // no throw: returns before GoBack
+
+        Assert.Null(api.LastMethod);
+        Assert.Contains("signer", vm.StatusMessage, StringComparison.OrdinalIgnoreCase);
+    }
+
+    [Fact]
+    public void Validate_command_gates_on_signature_and_command()
+    {
+        var api = new RecordingApi();
+        var front = new FrontOfficeApiClient(api, "https://business.example/api/v1/");
+        var vm = new EstimateValidationPageViewModel(
+            SampleEstimate(commandId: null), EstimateListPerspective.Provider, front);
+
+        var proPad = new SignaturePadControl();
+        vm.Attach(proPad, new SignaturePadControl());
+
+        // No CommandId ⇒ cannot validate even after signing.
+        DrawOneStroke(proPad);
+        Assert.False(vm.ValidateCommand.CanExecute(null));
+
+        var vm2 = new EstimateValidationPageViewModel(
+            SampleEstimate(), EstimateListPerspective.Provider, front);
+        var proPad2 = new SignaturePadControl();
+        vm2.Attach(proPad2, new SignaturePadControl());
+        Assert.False(vm2.ValidateCommand.CanExecute(null)); // no signature yet
+        DrawOneStroke(proPad2);
+        Assert.True(vm2.ValidateCommand.CanExecute(null));
+    }
+
+    [Fact]
+    public void RoleLabel_reflects_perspective()
+    {
+        var front = new FrontOfficeApiClient(new RecordingApi(), "https://business.example/api/v1/");
+        var pro = new EstimateValidationPageViewModel(
+            SampleEstimate(), EstimateListPerspective.Provider, front);
+        var cli = new EstimateValidationPageViewModel(
+            SampleEstimate(), EstimateListPerspective.Client, front);
+
+        Assert.Contains("prestataire", pro.RoleLabel, StringComparison.OrdinalIgnoreCase);
+        Assert.Contains("client", cli.RoleLabel, StringComparison.OrdinalIgnoreCase);
+    }
+
+    [Fact]
+    public void Only_the_author_pad_is_writable()
+    {
+        var front = new FrontOfficeApiClient(new RecordingApi(), "https://business.example/api/v1/");
+
+        var proVm = new EstimateValidationPageViewModel(
+            SampleEstimate(), EstimateListPerspective.Provider, front);
+        var proPad = new SignaturePadControl();
+        var cliPad = new SignaturePadControl();
+        proVm.Attach(proPad, cliPad);
+        Assert.False(proPad.IsReadOnly);  // provider writes the Pro pad
+        Assert.True(cliPad.IsReadOnly);
+
+        var cliVm = new EstimateValidationPageViewModel(
+            SampleEstimate(), EstimateListPerspective.Client, front);
+        var proPad2 = new SignaturePadControl();
+        var cliPad2 = new SignaturePadControl();
+        cliVm.Attach(proPad2, cliPad2);
+        Assert.True(proPad2.IsReadOnly);
+        Assert.False(cliPad2.IsReadOnly); // client writes the Client pad
+    }
+
+    [Fact]
+    public void Load_existing_signatures_renders_both_sides_in_their_pads()
+    {
+        var proStrokes = new[] { 1, 1000, 1000 };
+        var cliStrokes = new[] { 1, 9000, 9000 };
+        var front = new FrontOfficeApiClient(new RecordingApi(), "https://business.example/api/v1/");
+        var estimate = SampleEstimate();
+        estimate.SignaturePro = new EstimateSignatureDto { Strokes = proStrokes };
+        estimate.SignatureClient = new EstimateSignatureDto { Strokes = cliStrokes };
+
+        // Client perspective: both pads show the stored signatures, but
+        // only the client pad is writable.
+        var vm = new EstimateValidationPageViewModel(estimate, EstimateListPerspective.Client, front);
+        var proPad = new SignaturePadControl();
+        var cliPad = new SignaturePadControl();
+        vm.Attach(proPad, cliPad);
+
+        Assert.Equal(proStrokes, proPad.Snapshot().Strokes);
+        Assert.Equal(cliStrokes, cliPad.Snapshot().Strokes);
+        Assert.True(vm.HasProSignature);
+        Assert.True(vm.HasClientSignature);
+    }
+
+    [Fact]
+    public void Load_existing_pro_signature_renders_in_pro_pad_only()
+    {
+        var strokes = new[] { 1, 5000, 5000 };
+        var front = new FrontOfficeApiClient(new RecordingApi(), "https://business.example/api/v1/");
+        var estimate = SampleEstimate();
+        estimate.SignaturePro = new EstimateSignatureDto { Strokes = strokes, CoordinateMax = 10_000 };
+        var vm = new EstimateValidationPageViewModel(estimate, EstimateListPerspective.Provider, front);
+
+        var proPad = new SignaturePadControl();
+        var cliPad = new SignaturePadControl();
+        vm.Attach(proPad, cliPad);
+
+        Assert.Equal(strokes, proPad.Snapshot().Strokes);
+        Assert.True(cliPad.Snapshot().IsEmpty);
+        Assert.True(vm.HasProSignature);
+        Assert.False(vm.HasClientSignature);
+    }
+
+    private sealed class RecordingApi : IYavscApiClient
+    {
+        public HttpClient Http { get; } = new();
+        public HttpMethod? LastMethod { get; private set; }
+        public string? LastPath { get; private set; }
+        public object? LastBody { get; private set; }
+
+        public Task<T> CallAsync<T>(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            LastMethod = method;
+            LastPath = path;
+            LastBody = body;
+            return Task.FromResult(default(T)!);
+        }
+
+        public Task CallAsync(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            LastMethod = method;
+            LastPath = path;
+            LastBody = body;
+            return Task.CompletedTask;
+        }
+
+        public Task<T> CallAsync<T>(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync<T>(method, path, (object?)null, ct);
+
+        public Task CallAsync(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync(method, path, (object?)null, ct);
+
+        public ValueTask DisposeAsync() => ValueTask.CompletedTask;
+    }
+}

src/PostIt/PostIt.Tests/FrontOfficeApiClientTests.cs

@@ -0,0 +1,157 @@
+using System.Net.Http;
+using Yavsc.Api.Client;
+
+namespace PostIt.Tests;
+
+/// <summary>
+/// Verifies <see cref="FrontOfficeApiClient"/> issues the right
+/// <c>api/v1/front/query/accept</c> / <c>.../reject</c> requests with
+/// the PostIt signature payload, using a recording fake
+/// <see cref="IYavscApiClient"/> (no network).
+/// </summary>
+public class FrontOfficeApiClientTests
+{
+    private static QueryAcceptanceRequestDto SampleBody() => new()
+    {
+        Strokes = new[] { 2, 100, 200, 300, 400 },
+        CoordinateMax = 10_000,
+        CapturedAtUtc = new DateTime(2026, 9, 21, 12, 0, 0, DateTimeKind.Utc),
+    };
+
+    [Fact]
+    public async Task Accept_posts_to_accept_endpoint_with_signature_body()
+    {
+        var api = new RecordingApi();
+        var client = new FrontOfficeApiClient(api, "https://business.example/api/v1/");
+
+        var body = SampleBody();
+        await client.AcceptQueryAsync("Rdv", 42, body);
+
+        Assert.Equal(HttpMethod.Post, api.LastMethod);
+        Assert.Equal(
+            "https://business.example/api/v1/front/query/accept?billingCode=Rdv&queryId=42",
+            api.LastPath);
+        Assert.Same(body, api.LastBody);
+    }
+
+    [Fact]
+    public async Task Reject_posts_to_reject_endpoint_with_no_body()
+    {
+        var api = new RecordingApi();
+        var client = new FrontOfficeApiClient(api, "https://business.example/api/v1/");
+
+        await client.RejectQueryAsync("Rdv", 42);
+
+        Assert.Equal(HttpMethod.Post, api.LastMethod);
+        Assert.Equal(
+            "https://business.example/api/v1/front/query/reject?billingCode=Rdv&queryId=42",
+            api.LastPath);
+        Assert.Null(api.LastBody);
+    }
+
+    [Fact]
+    public async Task Accept_returns_deserialized_response()
+    {
+        var api = new RecordingApi
+        {
+            Response = new QueryAcceptanceResponseDto
+            {
+                QueryId = 42,
+                Status = "Accepted",
+                Signature = new QuerySignatureRefDto { Id = 9, EstimateId = 5, Type = "Pro" },
+            },
+        };
+        var client = new FrontOfficeApiClient(api, "https://business.example/api/v1/");
+
+        var response = await client.AcceptQueryAsync("Rdv", 42, SampleBody());
+
+        Assert.Equal(42, response.QueryId);
+        Assert.Equal("Accepted", response.Status);
+        Assert.NotNull(response.Signature);
+        Assert.Equal("Pro", response.Signature!.Type);
+    }
+
+    [Fact]
+    public async Task Accept_rejects_invalid_arguments()
+    {
+        var api = new RecordingApi();
+        var client = new FrontOfficeApiClient(api, "https://business.example/api/v1/");
+
+        await Assert.ThrowsAsync<ArgumentException>(() => client.AcceptQueryAsync("", 42, SampleBody()));
+        await Assert.ThrowsAsync<ArgumentOutOfRangeException>(() => client.AcceptQueryAsync("Rdv", 0, SampleBody()));
+        await Assert.ThrowsAsync<ArgumentNullException>(() => client.AcceptQueryAsync("Rdv", 42, null!));
+        await Assert.ThrowsAsync<ArgumentException>(() => client.RejectQueryAsync("", 42));
+        await Assert.ThrowsAsync<ArgumentOutOfRangeException>(() => client.RejectQueryAsync("Rdv", 0));
+    }
+
+    [Fact]
+    public async Task GetEstimatePdf_gets_estimate_pdf_endpoint()
+    {
+        var api = new RecordingApi();
+        var client = new FrontOfficeApiClient(api, "https://business.example/api/v1/");
+
+        await client.GetEstimatePdfAsync(42);
+
+        Assert.Equal(HttpMethod.Get, api.LastMethod);
+        Assert.Equal(
+            "https://business.example/api/v1/front/query/42/estimate.pdf",
+            api.LastPath);
+    }
+
+    [Fact]
+    public async Task GetEstimateTex_gets_estimate_tex_endpoint()
+    {
+        var api = new RecordingApi();
+        var client = new FrontOfficeApiClient(api, "https://business.example/api/v1/");
+
+        await client.GetEstimateTexAsync(42);
+
+        Assert.Equal(HttpMethod.Get, api.LastMethod);
+        Assert.Equal(
+            "https://business.example/api/v1/front/query/42/estimate.tex",
+            api.LastPath);
+    }
+
+    private sealed class RecordingApi : IYavscApiClient
+    {
+        public HttpClient Http { get; } = new();
+        public HttpMethod? LastMethod { get; private set; }
+        public string? LastPath { get; private set; }
+        public object? LastBody { get; private set; }
+        public QueryAcceptanceResponseDto? Response { get; set; }
+
+        public Task<T> CallAsync<T>(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            LastMethod = method;
+            LastPath = path;
+            LastBody = body;
+
+            var response = Response ?? new QueryAcceptanceResponseDto();
+            return Task.FromResult((T)(object)response);
+        }
+
+        public Task CallAsync(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            LastMethod = method;
+            LastPath = path;
+            LastBody = body;
+            return Task.CompletedTask;
+        }
+
+        public Task<T> CallAsync<T>(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync<T>(method, path, (object?)null, ct);
+
+        public Task CallAsync(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync(method, path, (object?)null, ct);
+
+        public Task<byte[]> DownloadAsync(HttpMethod method, string path, CancellationToken ct = default)
+        {
+            LastMethod = method;
+            LastPath = path;
+            LastBody = null;
+            return Task.FromResult(Array.Empty<byte>());
+        }
+
+        public ValueTask DisposeAsync() => ValueTask.CompletedTask;
+    }
+}

src/PostIt/PostIt.Tests/HomePageProviderFlowTests.cs

@@ -0,0 +1,15 @@
+using PostIt.ViewModels;
+
+namespace PostIt.Tests;
+
+public class HomePageProviderFlowTests
+{
+    [Fact]
+    public void HomePage_exposes_provider_requests_command()
+    {
+        var vm = new HomePageViewModel();
+
+        Assert.NotNull(vm.OpenProviderRequests);
+        Assert.True(vm.OpenProviderRequests.CanExecute(null));
+    }
+}

src/PostIt/PostIt.Tests/MainPageButtonsTests.cs

@@ -8,6 +8,8 @@ using Yavsc.Blogspot;
 using PostIt.Services;
 using PostIt.ViewModels;
 using PostIt.Views;
+using PostIt.Views.Blogs;
+using PostIt.Helpers;
 
 namespace PostIt.Tests;
 
@@ -72,13 +74,13 @@ public class MainPageButtonsTests
         { }
     }
 
-    private static MainViewModel MakeViewModel(BlogPostDto? selectedPost = null)
+    private static BlogsViewModel MakeViewModel(BlogPostDto? selectedPost = null)
     {
         var api = new ThrowingApi();
         var blog = new BlogApiClient(api, "http://localhost/");
         var circle = new CircleApiClient(api, "http://localhost/");
         var acl = new BlogAclApiClient(api, "http://localhost/");
-        // Minimal DI graph: only what MainPageViewModel resolves
+        // Minimal DI graph: only what BlogsViewModel resolves
         // when the user clicks a navigation button. Today that's
         // SignaturePageViewModel / CirclesPageViewModel / ACL
         // dependencies. The graph intentionally stays local to this
@@ -93,7 +95,7 @@ public class MainPageButtonsTests
         services.AddTransient<SignaturePage>();
         services.AddTransient<CirclesPage>();
         services.AddTransient<PostAclDialog>();
-        var vm = new MainViewModel(blog, services: services.BuildServiceProvider());
+        var vm = new BlogsViewModel(blog, services: services.BuildServiceProvider());
         if (selectedPost is not null) vm.SelectedPost = selectedPost;
         return vm;
     }
@@ -101,7 +103,7 @@ public class MainPageButtonsTests
     /// <summary>
     /// Mount a real <see cref="MainView"/> (as
     /// <c>SessionStatusBannerTests</c> does), push a
-    /// <see cref="MainPage"/> with the given VM onto
+    /// <see cref="BlogsPage"/> with the given VM onto
     /// <c>NavRoot</c>. <c>PushAsync</c> is awaited (via
     /// <c>GetAwaiter().GetResult()</c>) so the page is on the
     /// nav stack before the test tries to interact with its
@@ -109,13 +111,17 @@ public class MainPageButtonsTests
     /// realised and <c>KeyPressQwerty</c> has a real
     /// <see cref="TopLevel"/> to dispatch against.
     /// </summary>
-    private static (MainView window, MainPage page) MountMainPage(MainViewModel vm)
+    private static (MainView window, BlogsPage page) MountMainPage(BlogsViewModel vm)
     {
         var window = new MainView();
-        var page = new MainPage { DataContext = vm };
+        var page = new BlogsPage { DataContext = vm };
         var app = (PostIt.App)Application.Current!;
+
         app.AttachMainWindow(window);
+
         window.NavRoot.PushAsync(page).GetAwaiter().GetResult();
+        var mainWindow = new Window { Content = window };
+        mainWindow.Show();
         return (window, page);
     }
 
@@ -145,7 +151,7 @@ public class MainPageButtonsTests
     }
 
     [AvaloniaFact]
-    public void Acl_button_click_pushes_a_page_onto_nav_stack()
+    public async Task Acl_button_click_pushes_a_page_onto_nav_stack()
     {
         // Arrange: a VM whose SelectedPost is non-null so
         // CanManageAcl evaluates to true and the button is
@@ -178,7 +184,7 @@ public class MainPageButtonsTests
     }
 
     [AvaloniaFact]
-    public void Circles_button_click_pushes_a_page_onto_nav_stack()
+    public async Task Circles_button_click_pushes_a_page_onto_nav_stack()
     {
         // Arrange: OpenCircles has no CanExecute guard today —
         // any click should fire it and push the page.
@@ -203,7 +209,7 @@ public class MainPageButtonsTests
     public void Signature_dev_button_click_pushes_a_page_onto_nav_stack()
     {
         // Arrange: the "[DEV] Signature" button is bound to the
-        // MainPageViewModel.OpenSignatureDevCommand [RelayCommand].
+        // BlogsViewModel.OpenSignatureDevCommand [RelayCommand].
         // The click must push SignaturePage on top of NavRoot.
         // The ServiceCollection registered in MakeViewModel provides
         // SignaturePageViewModel so the command can resolve it via

src/PostIt/PostIt.Tests/MainPageSaveTests.cs

@@ -5,10 +5,11 @@ using Yavsc.Blogspot;
 using Yavsc.Api.Client;
 using PostIt.ViewModels;
 using PostIt.Views;
+using PostIt.Views.Blogs;
 namespace PostIt.Tests;
 
 /// <summary>
-/// Headless UI tests for the "Save" flow in <see cref="MainPage"/>.
+/// Headless UI tests for the "Save" flow in <see cref="BlogsPage"/>.
 /// The pattern is the one <c>SessionStatusBannerTests</c>
 /// established: <c>[AvaloniaFact]</c>, a <see cref="Window"/>
 /// hosting the page (via a <see cref="Frame"/> because
@@ -40,9 +41,9 @@ public class MainPageSaveTests
         var recorder = new CallRecorder();
         var api = new RecordingYavscApiClient(recorder);
         var blog = new BlogApiClient(api, "http://localhost/");
-        var viewModel = new MainViewModel(blog);
+        var viewModel = new BlogsViewModel(blog);
 
-        var page = new MainPage { DataContext = viewModel };
+        var page = new BlogsPage { DataContext = viewModel };
         // MainPage is a ContentPage (a Page, not a Control), so it
         // must be hosted in a navigation surface. The production
         // MainWindow.axaml uses NavigationPage, and the API is the
@@ -63,9 +64,7 @@ public class MainPageSaveTests
         const string typed = "Mon premier billet";
         titleBox.Text = typed;
 
-        var saveButton = window.GetVisualDescendants()
-            .OfType<Button>()
-            .Single(b => b.Content as string == "Save");
+        var saveButton = page.SaveButton;
         saveButton.Command!.Execute(null);
 
         // The Save command is async (RelayCommand over Task) but

src/PostIt/PostIt.Tests/PostAclDialogTests.cs

@@ -270,6 +270,12 @@ public class PostAclDialogTests
             return Task.CompletedTask;
         }
 
+        public Task<T> CallAsync<T>(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync<T>(method, path, (object?)null, ct);
+
+        public Task CallAsync(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync(method, path, (object?)null, ct);
+
         public ValueTask DisposeAsync() => ValueTask.CompletedTask;
     }
 }

src/PostIt/PostIt.Tests/PostIt.Tests.csproj

@@ -8,14 +8,13 @@
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
     <AssemblyVersion>1.1.0.0</AssemblyVersion>
     <FileVersion>1.1.0.0</FileVersion>
-    <InformationalVersion>1.1.0-beta.1+183.Branch.release-1.0.8-rc8.Sha.6cff3db32ecf72c0d2d430b7002fa7816a34e070</InformationalVersion>
-    <Version>1.1.0-beta.1</Version>
+    <InformationalVersion>1.1.0-estimate.1+343.Branch.feature-estimate.Sha.ba40698cc9562f0f4ad2dcad4dd20e638c05b07d</InformationalVersion>
+    <Version>1.1.0-estimate.1</Version>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" />
     <PackageReference Include="Xamarin.UITest" />
     <PackageReference Include="xunit.v3" />
-    <PackageReference Include="xunit.runner.visualstudio" />
     <PackageReference Include="coverlet.collector" />
     <PackageReference Include="Avalonia.Headless" />
     <PackageReference Include="Avalonia.Headless.XUnit" />

src/PostIt/PostIt.Tests/PostItViewModelTests.cs

@@ -11,25 +11,23 @@ public class PostItViewModelTests
     [Fact]
     public void SearchCommand_filters_posts_by_title_article_or_author()
     {
-        // MainPageViewModel no longer owns a BlogApiClient instance by
+        // BlogsViewModel no longer owns a BlogApiClient instance by
         // default; tests construct one with a fake YavscApiClient that
         // throws on any call (we never call the API in this test).
         var fakeApi = new ThrowingYavscApiClient();
         var blog = new BlogApiClient(fakeApi, "http://localhost/");
-        var viewModel = new MainViewModel(blog);
+        var viewModel = new BlogsViewModel(blog);
 
         viewModel.Posts.Add(new BlogPostDto { Id = 1, Title = "First post", Article = "Hello world", AuthorId = "alice" });
         viewModel.Posts.Add(new BlogPostDto { Id = 2, Title = "Second post", Article = "Nothing here", AuthorId = "bob" });
         viewModel.Posts.Add(new BlogPostDto { Id = 3, Title = "Third post", Article = "Search me", AuthorId = "carol" });
 
         viewModel.SearchText = "search";
-        viewModel.SearchCommand.Execute(null);
 
         Assert.Single(viewModel.FilteredPosts);
         Assert.Equal(3, viewModel.FilteredPosts[0].Id);
 
         viewModel.SearchText = "bob";
-        viewModel.SearchCommand.Execute(null);
 
         Assert.Single(viewModel.FilteredPosts);
         Assert.Equal(2, viewModel.FilteredPosts[0].Id);
@@ -60,7 +58,7 @@ public class PostItViewModelTests
     {
         var api = new RecordingPublishApi();
         var blog = new BlogApiClient(api, "http://localhost/");
-        var viewModel = new MainViewModel(blog);
+        var viewModel = new BlogsViewModel(blog);
 
         viewModel.SelectedPost = new BlogPostDto { Id = 42, IsPublished = false };
 
@@ -146,6 +144,12 @@ public class PostItViewModelTests
             return Task.CompletedTask;
         }
 
+        public Task<T> CallAsync<T>(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync<T>(method, path, (object?)null, ct);
+
+        public Task CallAsync(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync(method, path, (object?)null, ct);
+
         public ValueTask DisposeAsync() => ValueTask.CompletedTask;
     }
 }

src/PostIt/PostIt.Tests/ProviderOngoingRequestsPageViewModelTests.cs

@@ -0,0 +1,238 @@
+using System.Net.Http;
+using PostIt.ViewModels;
+using Yavsc;
+using Yavsc.Api.Client;
+
+namespace PostIt.Tests;
+
+public class ProviderOngoingRequestsPageViewModelTests
+{
+    [Fact]
+    public async Task RefreshAsync_calls_provider_endpoint_and_filters_out_unknown_billing_codes()
+    {
+        var api = new StubProviderApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm = new ProviderOngoingRequestsPageViewModel(client);
+
+        await vm.InitializeAsync();
+
+        Assert.Contains("https://business.example/api/v1/bill/provider/ongoing", api.Paths);
+        Assert.Equal(3, vm.Queries.Count);
+        Assert.Equal(12, vm.Queries[0].Id);
+        Assert.Equal(11, vm.Queries[1].Id);
+        Assert.Equal(10, vm.Queries[2].Id);
+    }
+
+    [Fact]
+    public async Task FilterText_filters_by_activity_code_and_status()
+    {
+        var api = new StubProviderApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm = new ProviderOngoingRequestsPageViewModel(client);
+
+        await vm.InitializeAsync();
+
+        vm.FilterText = "mbrush";
+        Assert.Single(vm.Queries);
+        Assert.Equal("MBrush", vm.Queries[0].BillingCode);
+
+        vm.FilterText = "accepted";
+        Assert.Single(vm.Queries);
+        Assert.Equal(QueryStatus.Accepted, vm.Queries[0].Status);
+    }
+
+    [Fact]
+    public async Task OpenSelectedEditorCommand_can_execute_only_when_selection_exists()
+    {
+        var api = new StubProviderApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm = new ProviderOngoingRequestsPageViewModel(client);
+
+        await vm.InitializeAsync();
+
+        Assert.False(vm.OpenSelectedEditorCommand.CanExecute(null));
+
+        vm.SelectedQuery = vm.Queries[0];
+
+        Assert.True(vm.OpenSelectedEditorCommand.CanExecute(null));
+    }
+
+    [Fact]
+    public async Task SelectedSortOption_date_keeps_most_recent_first()
+    {
+        var api = new StubProviderApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm = new ProviderOngoingRequestsPageViewModel(client);
+
+        await vm.InitializeAsync();
+        vm.SelectedSortOption = ProviderOngoingRequestsPageViewModel.SortByDate;
+
+        Assert.Equal(new long[] { 12, 11, 10 }, vm.Queries.Select(q => q.Id).ToArray());
+    }
+
+    [Fact]
+    public async Task SelectedSortOption_date_ascending_keeps_oldest_first()
+    {
+        var api = new StubProviderApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm = new ProviderOngoingRequestsPageViewModel(client);
+
+        await vm.InitializeAsync();
+        vm.SelectedSortOption = ProviderOngoingRequestsPageViewModel.SortByDateAsc;
+
+        Assert.Equal(new long[] { 10, 11, 12 }, vm.Queries.Select(q => q.Id).ToArray());
+    }
+
+    [Fact]
+    public async Task SelectedSortOption_status_prioritizes_inprogress_then_accepted_then_inserted()
+    {
+        var api = new StubProviderApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm = new ProviderOngoingRequestsPageViewModel(client);
+
+        await vm.InitializeAsync();
+        vm.SelectedSortOption = ProviderOngoingRequestsPageViewModel.SortByStatus;
+
+        Assert.Equal(new long[] { 11, 12, 10 }, vm.Queries.Select(q => q.Id).ToArray());
+    }
+
+    [Fact]
+    public void Constructor_reads_saved_sort_option_from_settings()
+    {
+        var api = new StubProviderApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var settings = new Settings
+        {
+            ProviderOngoingRequestsSortOption = ProviderOngoingRequestsPageViewModel.SortByStatus,
+        };
+
+        var vm = new ProviderOngoingRequestsPageViewModel(client, settings);
+
+        Assert.Equal(ProviderOngoingRequestsPageViewModel.SortByStatus, vm.SelectedSortOption);
+    }
+
+    [Fact]
+    public void Constructor_falls_back_to_default_when_saved_sort_is_invalid()
+    {
+        var api = new StubProviderApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var settings = new Settings
+        {
+            ProviderOngoingRequestsSortOption = "invalide",
+        };
+
+        var vm = new ProviderOngoingRequestsPageViewModel(client, settings);
+
+        Assert.Equal(ProviderOngoingRequestsPageViewModel.SortByDate, vm.SelectedSortOption);
+    }
+
+    [Fact]
+    public async Task CreateEstimateForSelectedCommand_requires_a_selection()
+    {
+        var api = new StubProviderApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var estimateClient = new EstimateApiClient(api, "https://business.example/api/v1/");
+        var vm = new ProviderOngoingRequestsPageViewModel(client, estimateClient: estimateClient);
+
+        await vm.InitializeAsync();
+
+        Assert.False(vm.CreateEstimateForSelectedCommand.CanExecute(null));
+
+        vm.SelectedQuery = vm.Queries[0];
+
+        Assert.True(vm.CreateEstimateForSelectedCommand.CanExecute(null));
+    }
+
+    [Fact]
+    public async Task CreateEstimateForSelectedCommand_is_disabled_without_estimate_client()
+    {
+        var api = new StubProviderApi();
+        var client = new BillingApiClient(api, "https://business.example/api/v1/");
+        var vm = new ProviderOngoingRequestsPageViewModel(client);
+
+        await vm.InitializeAsync();
+        vm.SelectedQuery = vm.Queries[0];
+
+        Assert.False(vm.CreateEstimateForSelectedCommand.CanExecute(null));
+    }
+
+    private sealed class StubProviderApi : IYavscApiClient
+    {
+        public HttpClient Http { get; } = new();
+        public List<string> Paths { get; } = new();
+
+        public Task<T> CallAsync<T>(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            Paths.Add(path);
+
+            if (typeof(T) == typeof(List<BillingQuerySummaryDto>))
+            {
+                var data = new List<BillingQuerySummaryDto>
+                {
+                    new()
+                    {
+                        Id = 10,
+                        BillingCode = "Rdv",
+                        ActivityCode = "dev",
+                        PerformerId = "perf-1",
+                        ClientId = "cli-1",
+                        Status = QueryStatus.Inserted,
+                        Description = "Rendez-vous",
+                        EventDate = new DateTime(2026, 9, 10, 10, 0, 0, DateTimeKind.Utc),
+                    },
+                    new()
+                    {
+                        Id = 11,
+                        BillingCode = "MBrush",
+                        ActivityCode = "hair",
+                        PerformerId = "perf-1",
+                        ClientId = "cli-2",
+                        Status = QueryStatus.InProgress,
+                        Description = "Coupe multiple",
+                        EventDate = new DateTime(2026, 9, 11, 10, 0, 0, DateTimeKind.Utc),
+                    },
+                    new()
+                    {
+                        Id = 12,
+                        BillingCode = "Brush",
+                        ActivityCode = "hair",
+                        PerformerId = "perf-1",
+                        ClientId = "cli-3",
+                        Status = QueryStatus.Accepted,
+                        Description = "Coupe simple",
+                        EventDate = new DateTime(2026, 9, 12, 10, 0, 0, DateTimeKind.Utc),
+                    },
+                    new()
+                    {
+                        Id = 13,
+                        BillingCode = "",
+                        ActivityCode = "unknown",
+                        PerformerId = "perf-1",
+                        ClientId = "cli-4",
+                        Status = QueryStatus.Accepted,
+                        Description = "Doit être filtrée",
+                        EventDate = new DateTime(2026, 9, 13, 10, 0, 0, DateTimeKind.Utc),
+                    }
+                };
+
+                return Task.FromResult((T)(object)data);
+            }
+
+            return Task.FromResult(default(T)!);
+        }
+
+        public Task CallAsync(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
+        {
+            Paths.Add(path);
+            return Task.CompletedTask;
+        }
+
+        public Task<T> CallAsync<T>(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync<T>(method, path, (object?)null, ct);
+
+        public Task CallAsync(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync(method, path, (object?)null, ct);
+
+        public ValueTask DisposeAsync() => ValueTask.CompletedTask;
+    }
+}

src/PostIt/PostIt.Tests/RdvPageHeadlessTests.cs

@@ -74,6 +74,12 @@ public class RdvPageHeadlessTests
         public Task CallAsync(HttpMethod method, string path, object? body = null, CancellationToken ct = default)
             => Task.CompletedTask;
 
+        public Task<T> CallAsync<T>(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync<T>(method, path, (object?)null, ct);
+
+        public Task CallAsync(HttpMethod method, string path, Func<HttpContent> contentFactory, CancellationToken ct = default)
+            => CallAsync(method, path, (object?)null, ct);
+
         public ValueTask DisposeAsync() => ValueTask.CompletedTask;
     }
-}
+}

src/PostIt/PostIt/App.axaml

@@ -11,5 +11,6 @@
 
      <Application.Styles>
         <FluentTheme />
+         <StyleInclude Source="avares://AvaloniaEdit/Themes/Fluent/AvaloniaEdit.xaml" />
     </Application.Styles>
 </Application>

src/PostIt/PostIt/App.axaml.cs

@@ -17,6 +17,7 @@ namespace PostIt;
 public partial class App : Application
 {
     private int _bootStarted;
+    public string? CliConfigFileSpecification {  get; private set; }
 
     /// <summary>
     /// DI container the platform entry points hand to ViewModels so
@@ -46,35 +47,48 @@ public partial class App : Application
 
         if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
         {
-            var window = ServiceProvider.GetRequiredService<MainWindow>();
-            desktop.MainWindow = window;
-            View = window.MainView;
-            this.ConfigureRootView(window.MainView);
-
-            ApplyDarkMode(settings);
+            InitializeClassicDesktopLifetime(settings, desktop);
         }
         else if (ApplicationLifetime is IActivityApplicationLifetime singleViewFactoryApplicationLifetime)
         {
-            singleViewFactoryApplicationLifetime.MainViewFactory =
-                () =>
-                {
-                    View = ServiceProvider.GetRequiredService<MainView>();
-                    this.ConfigureRootView(View);
-                    ApplyDarkMode(settings);
-                    return View;
-                };
+            InitializeActivityLifetime(settings, singleViewFactoryApplicationLifetime);
         }
         else if (ApplicationLifetime is ISingleViewApplicationLifetime singleViewPlatform)
         {
-            singleViewPlatform.MainView = View = ServiceProvider.GetRequiredService<MainView>();
-            ConfigureRootView(View);
-            ApplyDarkMode(settings);
+            InitializeSingleViewLifetime(settings, singleViewPlatform);
         }
 
         base.OnFrameworkInitializationCompleted();
     }
 
-private void ConfigureRootView(MainView rootView)
+    public void InitializeSingleViewLifetime(Settings settings, ISingleViewApplicationLifetime singleViewPlatform)
+    {
+        singleViewPlatform.MainView = View = ServiceProvider!.GetRequiredService<MainView>();
+        ConfigureRootView(View);
+        ApplyDarkMode(settings);
+    }
+
+    public void InitializeActivityLifetime(Settings settings, IActivityApplicationLifetime singleViewFactoryApplicationLifetime)
+    {
+        singleViewFactoryApplicationLifetime.MainViewFactory =
+                        () =>
+                        {
+                            this.ConfigureRootView(ServiceProvider!.GetRequiredService<MainView>());
+                            ApplyDarkMode(settings);
+                            return View!;
+                        };
+    }
+
+    public void InitializeClassicDesktopLifetime(Settings settings, IClassicDesktopStyleApplicationLifetime desktop)
+    {
+        var window = ServiceProvider!.GetRequiredService<MainWindow>();
+        desktop.MainWindow = window;
+        this.ConfigureRootView(window.MainView);
+
+        ApplyDarkMode(settings);
+    }
+
+    public void ConfigureRootView(MainView rootView)
 {
     // Déclencher le Boot une seule fois lors du chargement du contrôle à l'écran.
     rootView.AttachedToVisualTree += async (_, _) => await BootOnceAsync();
@@ -87,6 +101,7 @@ private void ConfigureRootView(MainView rootView)
     };
 
     rootView.SessionBanner.DataContext = sessionStatus;
+    this.View = rootView;
 }
 
     private async Task BootOnceAsync()
@@ -148,7 +163,7 @@ private void ConfigureRootView(MainView rootView)
     public static async Task PushBlogsPageAsync()
     {
         var app = (App)Current!;
-        var mainVm = app.ServiceProvider!.GetRequiredService<MainViewModel>();
+        var mainVm = app.ServiceProvider!.GetRequiredService<BlogsViewModel>();
         await mainVm.InitializeAsync();
         await app.PushPageAsync(mainVm);
     }
@@ -189,4 +204,9 @@ private void ConfigureRootView(MainView rootView)
     {
         await View!.NavRoot.PopAsync();
     }
+
+    internal void UseConfigFileWhenLoading(string configFile)
+    {
+        this.CliConfigFileSpecification = configFile;
+    }
 }

src/PostIt/PostIt/CLIOptions/CLIOptions.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using Mono.Options;
+using PostIt;
+using PostIt.ViewModels;
+
+public static class CLIOptionHandler
+{
+    public static void HandleArgs(string[] args)
+    {
+        bool showHelp = false;
+        string configFile = null;
+
+        var options = new OptionSet {
+            { "c|configuration=", "Configuration file to load", (string v) => configFile = v },
+            { "h|help", "Show this message and exit", v => showHelp = true }
+        };
+
+        List<string> extra = options.Parse(args);
+
+        if (showHelp)
+        {
+            Console.WriteLine("Usage: app [OPTIONS]+");
+            options.WriteOptionDescriptions(Console.Out);
+            return;
+        }
+        if (configFile != null)
+        {
+            var app = App.Current as App;
+            app.UseConfigFileWhenLoading(configFile);
+        }
+    }
+}

src/PostIt/PostIt/Controls/SignaturePadControl.cs

@@ -46,6 +46,21 @@ public class SignaturePadControl : TemplatedControl
         set => SetValue(CaptureAreaProperty, value);
     }
 
+    /// <summary>
+    /// When true the control ignores pointer input — it only displays
+    /// strokes loaded into its buffer (e.g. the other party's
+    /// signature, which must be shown but not editable). <see cref="Load"/>
+    /// and <see cref="Clear"/> still work.
+    /// </summary>
+    public static readonly StyledProperty<bool> IsReadOnlyProperty =
+        AvaloniaProperty.Register<SignaturePadControl, bool>(nameof(IsReadOnly));
+
+    public bool IsReadOnly
+    {
+        get => GetValue(IsReadOnlyProperty);
+        set => SetValue(IsReadOnlyProperty, value);
+    }
+
     /// <summary>
     /// Captured strokes in wire form. Exposed as a read-only view
     /// over the internal buffer. The buffer only mutates on the UI
@@ -109,6 +124,7 @@ public class SignaturePadControl : TemplatedControl
 
     private void OnCapturePressed(object? sender, PointerPressedEventArgs e)
     {
+        if (IsReadOnly) return;
         if (!e.GetCurrentPoint(CaptureArea).Properties.IsLeftButtonPressed) return;
         e.Pointer.Capture(CaptureArea);
         _capturing = true;
@@ -181,6 +197,38 @@ public class SignaturePadControl : TemplatedControl
         RedrawRequested?.Invoke(this, EventArgs.Empty);
     }
 
+    /// <summary>
+    /// Replace the buffer with the given wire-format strokes — e.g. a
+    /// signature loaded back from the server — and raise
+    /// <see cref="RedrawRequested"/> so the host view repaints the ink.
+    /// Loaded strokes are all sealed (there is no pending stroke).
+    /// Malformed input (a non-positive length prefix, or a stroke that
+    /// runs past the end of the array) is truncated at the offending
+    /// point so the buffer never holds an inconsistent state.
+    /// </summary>
+    public void Load(int[] strokes)
+    {
+        if (strokes is null) throw new ArgumentNullException(nameof(strokes));
+
+        _strokes.Clear();
+        _pendingPoints = 0;
+        _capturing = false;
+
+        int i = 0;
+        while (i < strokes.Length)
+        {
+            int k = strokes[i];
+            if (k <= 0) break;
+            if (i + 1 + 2 * k > strokes.Length) break;
+            _strokes.Add(k);
+            for (int p = 0; p < 2 * k; p++)
+                _strokes.Add(strokes[i + 1 + p]);
+            i += 1 + 2 * k;
+        }
+
+        RedrawRequested?.Invoke(this, EventArgs.Empty);
+    }
+
     /// <summary>
     /// Defensive copy of the current buffer wrapped in a
     /// <see cref="SignaturePadData"/>. Cheap; call only when the

src/PostIt/PostIt/Controls/SignaturePadView.axaml

@@ -0,0 +1,28 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:controls="using:PostIt.Controls"
+             x:Class="PostIt.Controls.SignaturePadView"
+             HorizontalAlignment="Stretch"
+             VerticalAlignment="Stretch">
+    <!--
+        Capture surface. The SignaturePadControl is render-agnostic,
+        so we host it inside a Border that is the capture area, and
+        overlay a Canvas for the visual feedback. The code-behind
+        repaints the canvas on every RedrawRequested. The Border size
+        is driven by the CaptureWidth / CaptureHeight styled properties.
+    -->
+    <Border x:Name="PadFrame"
+            BorderBrush="Black"
+            BorderThickness="1"
+            Background="White"
+            HorizontalAlignment="Left"
+            VerticalAlignment="Top"
+            ClipToBounds="True">
+        <Grid>
+            <controls:SignaturePadControl x:Name="InnerPad" />
+            <Canvas x:Name="InkLayer"
+                    Background="Transparent"
+                    IsHitTestVisible="False" />
+        </Grid>
+    </Border>
+</UserControl>

src/PostIt/PostIt/Controls/SignaturePadView.axaml.cs

@@ -0,0 +1,206 @@
+using System;
+using System.Collections.Generic;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.Shapes;
+using Avalonia.Media;
+using PostIt.Models;
+
+namespace PostIt.Controls;
+
+/// <summary>
+/// Reusable signature-capture surface: wraps the render-agnostic
+/// <see cref="SignaturePadControl"/> in a sized <see cref="Border"/>
+/// (the hit-test region) with an overlay <see cref="Canvas"/> that
+/// the code-behind repaints from the control's stroke buffer. Owns
+/// the ink-rendering logic so every page that captures a signature
+/// (the dev-only <c>SignaturePage</c>, the estimate validation page,
+/// ...) shares one implementation.
+///
+/// Hosts bind <see cref="CaptureWidth"/>/<see cref="CaptureHeight"/>
+/// (DIPs, defaults 600×200) to size the surface. View models attach
+/// to the inner <see cref="SignaturePad"/> control (exposed here) to
+/// read snapshots, drive <c>Clear</c>, and subscribe to
+/// <see cref="SignaturePadControl.StrokeCompleted"/> /
+/// <see cref="SignaturePadControl.RedrawRequested"/> — the same
+/// contract the headless tests use, since a <see cref="UserControl"/>
+/// needs its XAML loaded to be drivable.
+/// </summary>
+public partial class SignaturePadView : UserControl
+{
+    private static readonly IBrush StrokeBrush = new SolidColorBrush(Color.FromRgb(0x10, 0x10, 0x10));
+    private const double StrokeThickness = 2.0;
+    private const double CoordinateMax = 10_000.0;
+
+    // Last size the ink layer was painted at. LayoutUpdated repaints
+    // only when this changes, so adding/removing polyline children
+    // (which invalidates layout) does not loop.
+    private Size _lastPaintedSize;
+
+    public static readonly StyledProperty<double> CaptureWidthProperty =
+        AvaloniaProperty.Register<SignaturePadView, double>(nameof(CaptureWidth), 600);
+
+    public static readonly StyledProperty<double> CaptureHeightProperty =
+        AvaloniaProperty.Register<SignaturePadView, double>(nameof(CaptureHeight), 200);
+
+    public double CaptureWidth
+    {
+        get => GetValue(CaptureWidthProperty);
+        set => SetValue(CaptureWidthProperty, value);
+    }
+
+    public double CaptureHeight
+    {
+        get => GetValue(CaptureHeightProperty);
+        set => SetValue(CaptureHeightProperty, value);
+    }
+
+    /// <summary>
+    /// The underlying capture control. View models attach to this to
+    /// read <see cref="SignaturePadControl.Snapshot"/> / call
+    /// <see cref="SignaturePadControl.Clear"/> and subscribe to its
+    /// events; this view repaints the ink layer from the same buffer.
+    /// </summary>
+    public SignaturePadControl SignaturePad => InnerPad;
+
+    public SignaturePadView()
+    {
+        InitializeComponent();
+
+        // Wire the capture area: the Pad is the control, the
+        // surrounding Border (PadFrame) is the hit-test region. For an
+        // inline control with no template, capture wiring happens on
+        // first measure, which is guaranteed before the user can
+        // interact, so attaching here is safe.
+        InnerPad.CaptureArea = PadFrame;
+        ApplyFrameSize();
+
+        InnerPad.RedrawRequested += OnPadRedrawRequested;
+        // Repaint once layout completes so an ink buffer loaded before
+        // the first arrange (e.g. an existing signature on reopen)
+        // still renders without waiting for a pointer event. The
+        // handler repaints only on a size change to avoid a layout
+        // loop (child changes invalidate layout → LayoutUpdated).
+        LayoutUpdated += OnLayoutUpdated;
+    }
+
+    private void OnLayoutUpdated(object? sender, EventArgs e)
+    {
+        var size = EffectivePadSize();
+        if (size != _lastPaintedSize)
+            Repaint();
+    }
+
+    protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
+    {
+        base.OnPropertyChanged(change);
+        if (change.Property == CaptureWidthProperty || change.Property == CaptureHeightProperty)
+        {
+            ApplyFrameSize();
+            Repaint();
+        }
+    }
+
+    private void ApplyFrameSize()
+    {
+        if (PadFrame is null) return;
+        PadFrame.Width = Math.Max(1, CaptureWidth);
+        PadFrame.Height = Math.Max(1, CaptureHeight);
+    }
+
+    private void OnPadRedrawRequested(object? sender, EventArgs e) => Repaint();
+
+    /// <summary>Defensive copy of the current buffer.</summary>
+    public SignaturePadData Snapshot() => InnerPad.Snapshot();
+
+    /// <summary>Forget every captured stroke.</summary>
+    public void Clear() => InnerPad.Clear();
+
+    /// <summary>Wire-format strokes, forwarded from the inner control.</summary>
+    public IReadOnlyList<int> Strokes => InnerPad.Strokes;
+
+    /// <summary>
+    /// The effective ink surface size: the arranged bounds when
+    /// available, otherwise the explicitly sized
+    /// <see cref="CaptureWidth"/>/<see cref="CaptureHeight"/>. The
+    /// latter covers a repaint triggered before the first layout pass
+    /// (e.g. loading an existing signature on reopen), when Bounds is
+    /// still empty.
+    /// </summary>
+    private Size EffectivePadSize()
+    {
+        var w = PadFrame.Bounds.Width > 0 ? PadFrame.Bounds.Width : PadFrame.Width;
+        var h = PadFrame.Bounds.Height > 0 ? PadFrame.Bounds.Height : PadFrame.Height;
+        if (w <= 0 || double.IsNaN(w) || h <= 0 || double.IsNaN(h))
+            return default;
+        return new Size(w, h);
+    }
+
+    private void Repaint()
+    {
+        if (InkLayer is null) return;
+
+        var size = EffectivePadSize();
+        if (size == default) return;
+        _lastPaintedSize = size;
+
+        InkLayer.Children.Clear();
+        var w = size.Width;
+        var h = size.Height;
+
+        var pending = InnerPad.PendingStroke;
+        var strokes = InnerPad.Strokes;
+        int sealedCount = strokes.Count - pending.Count;
+        if (sealedCount < 0)
+        {
+            sealedCount = 0;
+        }
+
+        int i = 0;
+        while (i < sealedCount)
+        {
+            int k = strokes[i];
+            if (k <= 0) break;
+            i++; // skip the length prefix
+
+            var poly = new Polyline
+            {
+                Stroke = StrokeBrush,
+                StrokeThickness = StrokeThickness,
+                StrokeLineCap = PenLineCap.Round,
+                StrokeJoin = PenLineJoin.Round,
+            };
+            var pts = new List<Point>(k);
+            for (int p = 0; p < k; p++)
+            {
+                int nx = strokes[i++];
+                int ny = strokes[i++];
+                pts.Add(new Point(nx / CoordinateMax * w, ny / CoordinateMax * h));
+            }
+            poly.Points = pts;
+            InkLayer.Children.Add(poly);
+        }
+
+        if (pending.Count > 0)
+        {
+            var poly = new Polyline
+            {
+                Stroke = StrokeBrush,
+                StrokeThickness = StrokeThickness,
+                StrokeLineCap = PenLineCap.Round,
+                StrokeJoin = PenLineJoin.Round,
+            };
+
+            var pts = new List<Point>(pending.Count / 2);
+            for (int p = 0; p < pending.Count; p += 2)
+            {
+                int nx = pending[p];
+                int ny = pending[p + 1];
+                pts.Add(new Point(nx / CoordinateMax * w, ny / CoordinateMax * h));
+            }
+
+            poly.Points = pts;
+            InkLayer.Children.Add(poly);
+        }
+    }
+}

src/PostIt/PostIt/Helpers/FileSaveHelpers.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Platform.Storage;
+
+namespace PostIt.Helpers;
+
+/// <summary>
+/// Saves a downloaded byte payload to a file chosen by the user through
+/// the platform save picker. This is the first file-save (as opposed to
+/// file-open) helper in PostIt; the open picker is already used for blog
+/// attachment and avatar uploads
+/// (<see cref="Views.Blogs.BlogsPage"/>, <see cref="Views.Layout.SettingsPage"/>).
+///
+/// <para>The <c>TopLevel</c> hosting the picker is resolved from the
+/// application's root <c>MainView</c> (<c>App.View</c>), which works for
+/// both the desktop and single-view lifetimes.</para>
+/// </summary>
+public static class FileSaveHelpers
+{
+    /// <summary>
+    /// Prompt the user to choose a destination and write
+    /// <paramref name="content"/> to it. Returns false when the user
+    /// cancels the picker; throws on IO/platform errors so the caller
+    /// can surface them.
+    /// </summary>
+    public static async Task<bool> SaveAsync(
+        string suggestedName,
+        string defaultExtension,
+        byte[] content,
+        CancellationToken ct = default)
+    {
+        var view = (Application.Current as App)?.View;
+        var topLevel = view is null ? null : TopLevel.GetTopLevel(view);
+        if (topLevel is null)
+            throw new InvalidOperationException("Aucune fenêtre active pour enregistrer le fichier.");
+
+        var file = await topLevel.StorageProvider.SaveFilePickerAsync(new FilePickerSaveOptions
+        {
+            Title = "Enregistrer sous",
+            DefaultExtension = defaultExtension,
+            SuggestedFileName = suggestedName,
+            FileTypeChoices = new[]
+            {
+                new FilePickerFileType($"{defaultExtension.ToUpper()} file")
+                {
+                    Patterns = new[] { $"*.{defaultExtension}" }
+                }
+            }
+        }).ConfigureAwait(true);
+
+        if (file is null)
+            return false; // user cancelled
+
+        await using var stream = await file.OpenWriteAsync().ConfigureAwait(true);
+        await stream.WriteAsync(content, ct).ConfigureAwait(true);
+        return true;
+    }
+}

src/PostIt/PostIt/Helpers/ServiceCollectionHelpers.cs

@@ -3,6 +3,7 @@ using Microsoft.Extensions.DependencyInjection;
 using PostIt.Services;
 using PostIt.ViewModels;
 using PostIt.Views;
+using PostIt.Views.Blogs;
 using PostIt.Views.Commands;
 using Yavsc.Api.Client;
 
@@ -29,12 +30,14 @@ public static class ServiceCollectionHelpers
             () => settings.ApiUrl,
             () => settings.Authentication?.Authority);
         var billingClient = new BillingApiClient(api, () => settings.ApiUrl);
+        var estimateClient = new EstimateApiClient(api, () => settings.ApiUrl);
+        var frontClient = new FrontOfficeApiClient(api, () => settings.ApiUrl);
         var userDirectory = new UserDirectory(userSearchClient);
         var reverseGeocoding = new NominatimReverseGeocodingService();
 
         // Vues
         services.AddSingleton<MainView>();
-        services.AddSingleton<MainPage>();
+        services.AddSingleton<BlogsPage>();
         services.AddSingleton<MainWindow>();
 
         // SettingsPage is a singleton: there must be one and only one
@@ -58,6 +61,11 @@ public static class ServiceCollectionHelpers
         services.AddTransient<BrushPage>();
         services.AddTransient<BillingQueriesPage>();
         services.AddTransient<BillingQueryDetailsPage>();
+        services.AddTransient<ProviderOngoingRequestsPage>();
+        services.AddTransient<EstimateEditionPage>();
+        services.AddTransient<EstimateListPage>();
+        services.AddTransient<EstimateValidationPage>();
+
         // ViewModels
         services.AddSingleton(settings);
         services.AddSingleton<YavscApiClient>(api);
@@ -67,6 +75,8 @@ public static class ServiceCollectionHelpers
         services.AddSingleton(userSearchClient);
         services.AddSingleton(activityClient);
         services.AddSingleton(billingClient);
+        services.AddSingleton(estimateClient);
+        services.AddSingleton(frontClient);
         services.AddSingleton<IReverseGeocodingService>(reverseGeocoding);
         services.AddSingleton<IUserDirectory>(userDirectory);
         services.AddSingleton<HomePageViewModel>();
@@ -89,7 +99,7 @@ public static class ServiceCollectionHelpers
         sessionStatus.Refresh();
         services.AddSingleton(sessionStatus);
         services.AddSingleton<SessionStatusBanner>();
-        services.AddSingleton<MainViewModel>();
+        services.AddSingleton<BlogsViewModel>();
         return services.BuildServiceProvider();
     }
 }

src/PostIt/PostIt/Helpers/ViewModelBaseHelpers.cs

@@ -8,7 +8,7 @@ namespace PostIt.Helpers;
 
 public static class ViewModelBaseHelpers
 {
-    public static async Task PushPageAsync(this App app, ViewModelBase vm)
+    public static async Task<Page> PushPageAsync(this App app, ViewModelBase vm)
     {
         var window = app.View;
         if (window is null)
@@ -43,9 +43,11 @@ public static class ViewModelBaseHelpers
         var stack = window.NavRoot.NavigationStack;
         if (stack.Count > 0 && ReferenceEquals(stack[stack.Count - 1], page))
         {
-            return;
+            return page;
         }
 
         await window.NavRoot.PushAsync(page);
+
+        return page;
     }
 }

src/PostIt/PostIt/PostIt.csproj

@@ -5,8 +5,8 @@
     <LangVersion>latest</LangVersion>
     <AssemblyVersion>1.1.0.0</AssemblyVersion>
     <FileVersion>1.1.0.0</FileVersion>
-    <InformationalVersion>1.1.0-beta.1+183.Branch.release-1.0.8-rc8.Sha.6cff3db32ecf72c0d2d430b7002fa7816a34e070</InformationalVersion>
-    <Version>1.1.0-beta.1</Version>
+    <InformationalVersion>1.1.0-estimate.1+343.Branch.feature-estimate.Sha.ba40698cc9562f0f4ad2dcad4dd20e638c05b07d</InformationalVersion>
+    <Version>1.1.0-estimate.1</Version>
   </PropertyGroup>
   <ItemGroup>
     <AvaloniaResource Include="Assets\**" />
@@ -23,6 +23,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Avalonia" />
+    <PackageReference Include="Avalonia.AvaloniaEdit" />
     <PackageReference Include="Avalonia.Themes.Fluent" />
     <PackageReference Include="Avalonia.Fonts.Inter" />
     <PackageReference Include="AvaloniaUI.DiagnosticsSupport">
@@ -33,7 +34,9 @@
     <PackageReference Include="Mapsui.Avalonia12" />
     <PackageReference Include="CommunityToolkit.Mvvm" />
     <PackageReference Include="IdentityModel.OidcClient" />
+    <PackageReference Include="MarkdownViewer.Core" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" />
+    <PackageReference Include="Mono.Options" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="../../Yavsc.Abstract/Yavsc.Abstract.csproj" />

src/PostIt/PostIt/Services/YavscApiClient.cs

@@ -191,13 +191,52 @@ public class YavscApiClient : IYavscApiClient, IAsyncDisposable
         object? body = null,
         CancellationToken ct = default)
     {
-        using var response = await SendAsync(method, path, body, ct).ConfigureAwait(false);
+        using var response = await SendAsync(method, path, body is null ? null : () => JsonContent.Create(body), ct).ConfigureAwait(false);
         await EnsureSuccessOrThrowAsync(response, ct).ConfigureAwait(false);
 
-        var stream = await response.Content.ReadAsStreamAsync(ct).ConfigureAwait(false);
-        var dto = await JsonSerializer.DeserializeAsync<T>(stream,
-            new JsonSerializerOptions { PropertyNameCaseInsensitive = true }, ct).ConfigureAwait(false);
-        return dto!;
+        return await ReadJsonAsync<T>(response, ct).ConfigureAwait(false);
+    }
+
+    /// <summary>
+    /// Call a multipart endpoint, transparently refreshing the token if needed.
+    /// </summary>
+    public virtual async Task<T> CallAsync<T>(
+        HttpMethod method,
+        string path,
+        Func<HttpContent> contentFactory,
+        CancellationToken ct = default)
+    {
+        if (contentFactory is null)
+            throw new ArgumentNullException(nameof(contentFactory));
+
+        using var response = await SendAsync(method, path, contentFactory, ct).ConfigureAwait(false);
+        await EnsureSuccessOrThrowAsync(response, ct).ConfigureAwait(false);
+
+        return await ReadJsonAsync<T>(response, ct).ConfigureAwait(false);
+    }
+
+    /// <summary>
+    /// Deserialise the response body as <typeparamref name="T"/>,
+    /// tolerating an empty body. <c>PUT /blogspot/{id}</c> answers
+    /// <c>204 No Content</c>: without this guard,
+    /// <c>JsonSerializer.DeserializeAsync</c> throws
+    /// <c>JsonException: The input does not contain any JSON
+    /// tokens</c> and the VM surfaces a successful save as an
+    /// error. Callers that genuinely need a payload
+    /// (<c>GetPostAsync</c>, <c>CreatePostAsync</c>) are unaffected:
+    /// their endpoints always return a body.
+    /// </summary>
+    private static async Task<T> ReadJsonAsync<T>(HttpResponseMessage response, CancellationToken ct)
+    {
+        if (response.StatusCode == HttpStatusCode.NoContent)
+            return default!;
+
+        var payload = await response.Content.ReadAsStringAsync(ct).ConfigureAwait(false);
+        if (string.IsNullOrWhiteSpace(payload))
+            return default!;
+
+        return JsonSerializer.Deserialize<T>(payload,
+            new JsonSerializerOptions { PropertyNameCaseInsensitive = true })!;
     }
 
     /// <summary>
@@ -217,7 +256,23 @@ public class YavscApiClient : IYavscApiClient, IAsyncDisposable
         object? body = null,
         CancellationToken ct = default)
     {
-        using var response = await SendAsync(method, path, body, ct).ConfigureAwait(false);
+        using var response = await SendAsync(method, path, body is null ? null : () => JsonContent.Create(body), ct).ConfigureAwait(false);
+        await EnsureSuccessOrThrowAsync(response, ct).ConfigureAwait(false);
+    }
+
+    /// <summary>
+    /// Call a multipart endpoint that returns no useful body (DELETE, etc.).
+    /// </summary>
+    public async Task CallAsync(
+        HttpMethod method,
+        string path,
+        Func<HttpContent> contentFactory,
+        CancellationToken ct = default)
+    {
+        if (contentFactory is null)
+            throw new ArgumentNullException(nameof(contentFactory));
+
+        using var response = await SendAsync(method, path, contentFactory, ct).ConfigureAwait(false);
         await EnsureSuccessOrThrowAsync(response, ct).ConfigureAwait(false);
     }
 
@@ -232,7 +287,7 @@ public class YavscApiClient : IYavscApiClient, IAsyncDisposable
         => CallAsync(method, path, body: null, ct);
 
     private async Task<HttpResponseMessage> SendAsync(
-        HttpMethod method, string path, object? body, CancellationToken ct)
+        HttpMethod method, string path, Func<HttpContent>? contentFactory, CancellationToken ct)
     {
         if (_tokens is null)
             throw new InvalidOperationException("Not logged in. Call LoginInteractiveAsync first.");
@@ -240,8 +295,8 @@ public class YavscApiClient : IYavscApiClient, IAsyncDisposable
         await EnsureFreshTokenAsync(ct).ConfigureAwait(false);
 
         using var req = new HttpRequestMessage(method, path);
-        if (body is not null)
-            req.Content = JsonContent.Create(body);
+        if (contentFactory is not null)
+            req.Content = contentFactory();
         var response = await Http.SendAsync(req, ct).ConfigureAwait(false);
 
         if (response.StatusCode == HttpStatusCode.Unauthorized)
@@ -252,8 +307,8 @@ public class YavscApiClient : IYavscApiClient, IAsyncDisposable
             await ForceRefreshAsync(ct).ConfigureAwait(false);
 
             using var retry = new HttpRequestMessage(method, path);
-            if (body is not null)
-                retry.Content = JsonContent.Create(body);
+            if (contentFactory is not null)
+                retry.Content = contentFactory();
             response = await Http.SendAsync(retry, ct).ConfigureAwait(false);
         }
 
@@ -423,6 +478,41 @@ public class YavscApiClient : IYavscApiClient, IAsyncDisposable
         return "Avatar mis à jour.";
     }
 
+    /// <summary>
+    /// Download a binary resource (PDF, TeX, …) from the API. Unlike
+    /// <see cref="CallAsync{T}(HttpMethod, string, object?, CancellationToken)"/>,
+    /// which JSON-decodes the response, this returns the raw response
+    /// bytes. Reuses the same Bearer-token attach + 401-refresh-retry-once
+    /// contract as <see cref="SetAvatarAsync"/>.
+    /// </summary>
+    public virtual async Task<byte[]> DownloadAsync(
+        HttpMethod method,
+        string path,
+        CancellationToken ct = default)
+    {
+        if (_tokens is null)
+            throw new InvalidOperationException("Not logged in. Call LoginInteractiveAsync first.");
+
+        await EnsureFreshTokenAsync(ct).ConfigureAwait(false);
+
+        var sendOnce = async () =>
+        {
+            using var request = new HttpRequestMessage(method, path);
+            return await Http.SendAsync(request, ct).ConfigureAwait(false);
+        };
+
+        var response = await sendOnce().ConfigureAwait(false);
+        if (response.StatusCode == HttpStatusCode.Unauthorized)
+        {
+            response.Dispose();
+            await ForceRefreshAsync(ct).ConfigureAwait(false);
+            response = await sendOnce().ConfigureAwait(false);
+        }
+
+        await EnsureSuccessOrThrowAsync(response, ct).ConfigureAwait(false);
+        return await response.Content.ReadAsByteArrayAsync(ct).ConfigureAwait(false);
+    }
+
     public async Task LogoutAsync()
     {
         _store.Clear();

src/PostIt/PostIt/ViewLocator.cs

@@ -6,6 +6,7 @@ using Microsoft.Extensions.DependencyInjection;
 using PostIt.ViewModels;
 using PostIt.ViewModels.Commands;
 using PostIt.Views;
+using PostIt.Views.Blogs;
 using PostIt.Views.Commands;
 
 namespace PostIt;
@@ -38,7 +39,7 @@ public class ViewLocator : IDataTemplate
         var services = app!.ServiceProvider!;
         return data switch
         {
-            MainViewModel => services.GetRequiredService<MainPage>(),
+            BlogsViewModel => services.GetRequiredService<BlogsPage>(),
             Settings => services.GetRequiredService<SettingsPage>(),
             HomePageViewModel => services.GetRequiredService<HomePage>(),
             ActivitiesPageViewModel => services.GetRequiredService<ActivitiesPage>(),
@@ -51,6 +52,10 @@ public class ViewLocator : IDataTemplate
             PostAclDialogViewModel => services.GetRequiredService<PostAclDialog>(),
             BillingQueriesPageViewModel => services.GetRequiredService<BillingQueriesPage>(),
             BillingQueryDetailsPageViewModel => services.GetRequiredService<BillingQueryDetailsPage>(),
+            ProviderOngoingRequestsPageViewModel => services.GetRequiredService<ProviderOngoingRequestsPage>(),
+            EstimateEditionPageViewModel => services.GetRequiredService<EstimateEditionPage>(),
+            EstimateListPageViewModel => services.GetRequiredService<EstimateListPage>(),
+            EstimateValidationPageViewModel => services.GetRequiredService<EstimateValidationPage>(),
             null => new TextBlock { Text = "No view for <null>" },
             _ => new TextBlock { Text = $"No view for {data.GetType().Name}" }
         };

src/PostIt/PostIt/ViewModels/Activity/BillingQueriesPageViewModel.cs

@@ -7,6 +7,7 @@ using System.Threading.Tasks;
 using Avalonia;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
+using Microsoft.Extensions.DependencyInjection;
 using PostIt.Helpers;
 using Yavsc;
 using Yavsc.Api.Client;
@@ -43,7 +44,7 @@ public partial class BillingQueriesPageViewModel : ViewModelBase, IActionStatusV
         ? $"Demandes en cours ({Form.Title})"
         : $"Commandes {Form.Title}";
     public string ContextLabel => $"{Performer.UserName} · {Activity.Name}";
-    public bool CanOpenDetails => true;
+    public bool CanOpenDetails => !IsReadOnly;
 
     public override bool CanNavigateNext
     {
@@ -75,7 +76,7 @@ public partial class BillingQueriesPageViewModel : ViewModelBase, IActionStatusV
 
     public Task InitializeAsync() => RefreshAsync();
 
-    private bool CanOpenSelectedQuery() => SelectedQuery is not null;
+    private bool CanOpenSelectedQuery() => CanOpenDetails && SelectedQuery is not null;
 
     [RelayCommand]
     public async Task RefreshAsync()
@@ -130,11 +131,13 @@ public partial class BillingQueriesPageViewModel : ViewModelBase, IActionStatusV
         try
         {
             var details = await _billingClient.GetQueryAsync(Form.ActionName, SelectedQuery.Id).ConfigureAwait(true);
+            var frontClient = app.ServiceProvider?.GetRequiredService<FrontOfficeApiClient>();
             var vm = new BillingQueryDetailsPageViewModel(
                 Activity,
                 Performer,
                 Form,
                 _billingClient,
+                frontClient,
                 details,
                 IsReadOnly);
             await app.PushPageAsync(vm).ConfigureAwait(true);
@@ -171,5 +174,9 @@ public partial class BillingQueriesPageViewModel : ViewModelBase, IActionStatusV
     }
 
     private static bool IsOngoingStatus(QueryStatus status)
-        => status is QueryStatus.Inserted or QueryStatus.Accepted or QueryStatus.InProgress;
+        => status is QueryStatus.Inserted
+            or QueryStatus.Accepted
+            or QueryStatus.ProAccepted
+            or QueryStatus.ClientAccepted
+            or QueryStatus.InProgress;
 }

src/PostIt/PostIt/ViewModels/Activity/BillingQueryDetailsPageViewModel.cs

@@ -14,6 +14,7 @@ namespace PostIt.ViewModels;
 public partial class BillingQueryDetailsPageViewModel : ViewModelBase, IActionStatusViewModel
 {
     private readonly BillingApiClient _billingClient;
+    private readonly FrontOfficeApiClient _frontClient;
     private readonly BillingQueryDetailsDto _details;
 
     public ActivityInfo Activity { get; }
@@ -68,6 +69,7 @@ public partial class BillingQueryDetailsPageViewModel : ViewModelBase, IActionSt
         ActivityUserDisplayItem performer,
         CommandFormSummary form,
         BillingApiClient billingClient,
+        FrontOfficeApiClient frontClient,
         BillingQueryDetailsDto details,
         bool isReadOnly)
     {
@@ -75,6 +77,7 @@ public partial class BillingQueryDetailsPageViewModel : ViewModelBase, IActionSt
         Performer = performer ?? throw new ArgumentNullException(nameof(performer));
         Form = form ?? throw new ArgumentNullException(nameof(form));
         _billingClient = billingClient ?? throw new ArgumentNullException(nameof(billingClient));
+        _frontClient = frontClient ?? throw new ArgumentNullException(nameof(frontClient));
         _details = details ?? throw new ArgumentNullException(nameof(details));
         IsReadOnly = isReadOnly;
 
@@ -131,6 +134,53 @@ public partial class BillingQueryDetailsPageViewModel : ViewModelBase, IActionSt
         await app.GoBackAsync().ConfigureAwait(true);
     }
 
+    /// <summary>
+    /// Download the estimate linked to this command as a LaTeX source
+    /// (<c>GET api/v1/front/query/{Id}/estimate.tex</c>). The estimate is
+    /// resolved server-side from <c>Estimate.CommandId == query Id</c>.
+    /// </summary>
+    [RelayCommand]
+    public async Task DownloadTexAsync()
+    {
+        await DownloadAsync(
+            () => _frontClient.GetEstimateTexAsync(_details.Id),
+            $"devis-{_details.Id}", "tex").ConfigureAwait(true);
+    }
+
+    /// <summary>
+    /// Download the estimate linked to this command as a compiled PDF
+    /// (<c>GET api/v1/front/query/{Id}/estimate.pdf</c>). Requires
+    /// <c>texi2pdf</c> on the server host.
+    /// </summary>
+    [RelayCommand]
+    public async Task DownloadPdfAsync()
+    {
+        await DownloadAsync(
+            () => _frontClient.GetEstimatePdfAsync(_details.Id),
+            $"devis-{_details.Id}", "pdf").ConfigureAwait(true);
+    }
+
+    private async Task DownloadAsync(Func<Task<byte[]>> fetch, string fileName, string ext)
+    {
+        IsBusy = true;
+        try
+        {
+            var bytes = await fetch().ConfigureAwait(true);
+            var saved = await FileSaveHelpers.SaveAsync(fileName, ext, bytes).ConfigureAwait(true);
+            this.SetInfoStatus(saved
+                ? $"Fichier .{ext} enregistré."
+                : "Téléchargement annulé.");
+        }
+        catch (Exception ex)
+        {
+            this.SetErrorStatus($"Échec du téléchargement: {ex.Message}");
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
     private static string EmptyAsPlaceholder(string? value, string placeholder)
         => string.IsNullOrWhiteSpace(value) ? placeholder : value;
 
@@ -166,6 +216,8 @@ public partial class BillingQueryDetailsPageViewModel : ViewModelBase, IActionSt
         => status switch
         {
             QueryStatus.Accepted => "#E6F7EC",
+            QueryStatus.ProAccepted => "#E6F7EC",
+            QueryStatus.ClientAccepted => "#E1F5FE",
             QueryStatus.InProgress => "#FFF4D6",
             QueryStatus.Rejected => "#FDECEA",
             QueryStatus.Failed => "#ECEFF1",
@@ -177,6 +229,8 @@ public partial class BillingQueryDetailsPageViewModel : ViewModelBase, IActionSt
         => status switch
         {
             QueryStatus.Accepted => "#2E7D32",
+            QueryStatus.ProAccepted => "#2E7D32",
+            QueryStatus.ClientAccepted => "#1565C0",
             QueryStatus.InProgress => "#B26A00",
             QueryStatus.Rejected => "#C62828",
             QueryStatus.Failed => "#607D8B",
@@ -188,6 +242,8 @@ public partial class BillingQueryDetailsPageViewModel : ViewModelBase, IActionSt
         => status switch
         {
             QueryStatus.Accepted => "#1B5E20",
+            QueryStatus.ProAccepted => "#1B5E20",
+            QueryStatus.ClientAccepted => "#0D47A1",
             QueryStatus.InProgress => "#7A4A00",
             QueryStatus.Rejected => "#8E0000",
             QueryStatus.Failed => "#37474F",
@@ -199,6 +255,8 @@ public partial class BillingQueryDetailsPageViewModel : ViewModelBase, IActionSt
         => status switch
         {
             QueryStatus.Accepted => "OK",
+            QueryStatus.ProAccepted => "P",
+            QueryStatus.ClientAccepted => "C",
             QueryStatus.InProgress => "~",
             QueryStatus.Rejected => "!",
             QueryStatus.Failed => "X",

src/PostIt/PostIt/ViewModels/Activity/EstimateEditionPageViewModel.cs

@@ -0,0 +1,293 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+using System.ComponentModel;
+using System.Linq;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Avalonia;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using PostIt.Helpers;
+using Yavsc.Api.Client;
+
+namespace PostIt.ViewModels;
+
+/// <summary>
+/// Edition d'un devis (<c>Estimate</c>) créé en réponse à une demande
+/// client (<see cref="BillingQuerySummaryDto"/>) consultée depuis la
+/// page « Mes demandes en cours ». L'envoi poste le devis sur
+/// <c>api/v1/estimate</c>; côté serveur, la commande liée
+/// (<see cref="BillingQuerySummaryDto.Id"/>) est alors marquée comme
+/// validée par le prestataire.
+/// </summary>
+public partial class EstimateEditionPageViewModel : ViewModelBase, IActionStatusViewModel
+{
+    private readonly EstimateApiClient _estimateClient;
+    private readonly BillingQuerySummaryDto _query;
+
+    public long QueryId => _query.Id;
+    public string ClientId => _query.ClientId;
+    public string BillingCode => _query.BillingCode;
+
+    public string Title => $"Devis — demande #{_query.Id}";
+
+    public string ContextLabel
+        => $"Demande #{_query.Id} · {BillingCode} · client {ClientId}";
+
+    public string QueryDescription => string.IsNullOrWhiteSpace(_query.Description)
+        ? "(sans description)"
+        : _query.Description;
+
+    [ObservableProperty]
+    public partial string EstimateTitle { get; set; } = string.Empty;
+
+    [ObservableProperty]
+    public partial string EstimateDescription { get; set; } = string.Empty;
+
+    [ObservableProperty]
+    public partial ObservableCollection<EstimateLineItemViewModel> Lines { get; set; } = new();
+
+    [ObservableProperty, NotifyCanExecuteChangedFor(nameof(RemoveLineCommand))]
+    public partial EstimateLineItemViewModel? SelectedLine { get; set; }
+
+    [ObservableProperty, NotifyCanExecuteChangedFor(nameof(SendCommand))]
+    public partial bool IsBusy { get; set; }
+
+    /// <summary>
+    /// True une fois le devis accepté par le serveur: l'envoi est
+    /// désactivé pour éviter les doublons, il ne reste que « Retour ».
+    /// </summary>
+    [ObservableProperty, NotifyCanExecuteChangedFor(nameof(SendCommand))]
+    public partial bool HasSent { get; set; }
+
+    [ObservableProperty]
+    public partial string StatusMessage { get; set; } = "Prêt.";
+
+    [ObservableProperty]
+    public partial StatusNotice ActionStatus { get; set; } = StatusNotice.Info("Prêt.");
+
+    public decimal Total => Lines.Sum(line => line.LineTotal);
+
+    public string TotalLabel => $"{Total:0.00} {Lines.FirstOrDefault()?.Currency ?? "EUR"}";
+
+    public string SendLabel => HasSent ? "Devis envoyé" : "Envoyer le devis";
+
+    public override bool CanNavigateNext
+    {
+        get => false;
+        protected set { _ = value; }
+    }
+
+    public override bool CanNavigatePrevious
+    {
+        get => true;
+        protected set { _ = value; }
+    }
+
+    public EstimateEditionPageViewModel(BillingQuerySummaryDto query, EstimateApiClient estimateClient)
+    {
+        _query = query ?? throw new ArgumentNullException(nameof(query));
+        _estimateClient = estimateClient ?? throw new ArgumentNullException(nameof(estimateClient));
+
+        EstimateDescription = query.Description ?? string.Empty;
+        Lines.CollectionChanged += OnLinesCollectionChanged;
+
+        AddLine();
+        this.SetInfoStatus("Complétez le devis puis envoyez-le. La demande associée sera validée.");
+    }
+
+    [RelayCommand]
+    private void AddLine()
+    {
+        var line = new EstimateLineItemViewModel();
+        Lines.Add(line);
+        SelectedLine = line;
+    }
+
+    private bool CanRemoveLine() => SelectedLine is not null && !IsBusy && !HasSent;
+
+    [RelayCommand(CanExecute = nameof(CanRemoveLine))]
+    private void RemoveLine()
+    {
+        if (SelectedLine is null)
+        {
+            return;
+        }
+
+        var index = Lines.IndexOf(SelectedLine);
+        Lines.Remove(SelectedLine);
+        SelectedLine = Lines.Count == 0
+            ? null
+            : Lines[Math.Min(index, Lines.Count - 1)];
+    }
+
+    private bool CanSend() => !IsBusy && !HasSent;
+
+    [RelayCommand(CanExecute = nameof(CanSend))]
+    private async Task SendAsync()
+    {
+        if (!TryValidate(out var validationMessage))
+        {
+            this.SetWarningStatus(validationMessage);
+            return;
+        }
+
+        IsBusy = true;
+        try
+        {
+            var payload = BuildPayload();
+            var created = await _estimateClient.CreateAsync(payload).ConfigureAwait(true);
+
+            HasSent = true;
+            OnPropertyChanged(nameof(SendLabel));
+            this.SetInfoStatus(
+                $"Devis #{created.Id} envoyé ({created.Bill.Count} ligne(s)). La demande #{QueryId} est validée.");
+        }
+        catch (HttpRequestException ex) when (ex.StatusCode is HttpStatusCode.Unauthorized or HttpStatusCode.Forbidden)
+        {
+            this.SetWarningStatus("Accès refusé à l'API devis (scope 'api'). Déconnectez puis reconnectez-vous.");
+        }
+        catch (Exception ex)
+        {
+            this.SetErrorStatus($"Erreur lors de l'envoi du devis: {ex.Message}");
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
+    [RelayCommand]
+    private async Task BackAsync()
+    {
+        var app = (App?)Application.Current;
+        if (app is null)
+        {
+            throw new InvalidOperationException("Application PostIt indisponible.");
+        }
+
+        await app.GoBackAsync().ConfigureAwait(true);
+    }
+
+    internal EstimateDto BuildPayload()
+    {
+        return new EstimateDto
+        {
+            CommandId = QueryId,
+            ClientId = ClientId,
+            CommandType = BillingCode,
+            Title = EstimateTitle.Trim(),
+            Description = EstimateDescription.Trim(),
+            Bill = Lines.Select(line => new EstimateLineDto
+            {
+                Id = line.Id,
+                Name = line.Name.Trim(),
+                Description = line.Description.Trim(),
+                Count = Math.Max(1, (int)Math.Round(line.Count)),
+                UnitaryCost = line.UnitaryCost,
+                Currency = string.IsNullOrWhiteSpace(line.Currency) ? "EUR" : line.Currency.Trim(),
+            }).ToList(),
+        };
+    }
+
+    private bool TryValidate(out string message)
+    {
+        if (string.IsNullOrWhiteSpace(EstimateTitle))
+        {
+            message = "Le titre du devis est requis.";
+            return false;
+        }
+
+        if (string.IsNullOrWhiteSpace(ClientId))
+        {
+            message = "La demande sélectionnée n'identifie pas de client.";
+            return false;
+        }
+
+        if (string.IsNullOrWhiteSpace(BillingCode))
+        {
+            message = "La demande sélectionnée n'a pas de code de facturation.";
+            return false;
+        }
+
+        if (Lines.Count == 0)
+        {
+            message = "Ajoutez au moins une ligne au devis.";
+            return false;
+        }
+
+        foreach (var line in Lines)
+        {
+            if (string.IsNullOrWhiteSpace(line.Name))
+            {
+                message = "Chaque ligne doit avoir un nom.";
+                return false;
+            }
+
+            if (line.Name.Trim().Length > 256)
+            {
+                message = $"Le nom de la ligne « {line.Name.Trim()[..20]}… » dépasse 256 caractères.";
+                return false;
+            }
+
+            if (string.IsNullOrWhiteSpace(line.Description))
+            {
+                message = $"La ligne « {line.Name.Trim()} » doit avoir une description.";
+                return false;
+            }
+
+            if (line.Description.Trim().Length > 512)
+            {
+                message = $"La description de la ligne « {line.Name.Trim()} » dépasse 512 caractères.";
+                return false;
+            }
+
+            if (line.Count < 1)
+            {
+                message = $"La quantité de la ligne « {line.Name.Trim()} » doit être d'au moins 1.";
+                return false;
+            }
+        }
+
+        message = string.Empty;
+        return true;
+    }
+
+    private void OnLinesCollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
+    {
+        if (e.OldItems is not null)
+        {
+            foreach (var item in e.OldItems.OfType<EstimateLineItemViewModel>())
+            {
+                item.PropertyChanged -= OnLinePropertyChanged;
+            }
+        }
+
+        if (e.NewItems is not null)
+        {
+            foreach (var item in e.NewItems.OfType<EstimateLineItemViewModel>())
+            {
+                item.PropertyChanged += OnLinePropertyChanged;
+            }
+        }
+
+        RaiseTotalsChanged();
+    }
+
+    private void OnLinePropertyChanged(object? sender, PropertyChangedEventArgs e)
+    {
+        if (e.PropertyName is nameof(EstimateLineItemViewModel.LineTotal)
+            or nameof(EstimateLineItemViewModel.Currency))
+        {
+            RaiseTotalsChanged();
+        }
+    }
+
+    private void RaiseTotalsChanged()
+    {
+        OnPropertyChanged(nameof(Total));
+        OnPropertyChanged(nameof(TotalLabel));
+    }
+}

src/PostIt/PostIt/ViewModels/Activity/EstimateLineItemViewModel.cs

@@ -0,0 +1,35 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace PostIt.ViewModels;
+
+/// <summary>
+/// Editable estimate line. <see cref="Count"/> is exposed as a
+/// <see cref="decimal"/> so it binds directly to
+/// <c>NumericUpDown.Value</c> (<c>decimal?</c>); it is rounded back
+/// to an integer when the DTO is built.
+/// </summary>
+public partial class EstimateLineItemViewModel : ObservableObject
+{
+    public long Id { get; set; }
+
+    [ObservableProperty]
+    public partial string Name { get; set; } = string.Empty;
+
+    [ObservableProperty]
+    public partial string Description { get; set; } = string.Empty;
+
+    [ObservableProperty, NotifyPropertyChangedFor(nameof(LineTotal))]
+    [NotifyPropertyChangedFor(nameof(LineTotalLabel))]
+    public partial decimal Count { get; set; } = 1m;
+
+    [ObservableProperty, NotifyPropertyChangedFor(nameof(LineTotal))]
+    [NotifyPropertyChangedFor(nameof(LineTotalLabel))]
+    public partial decimal UnitaryCost { get; set; }
+
+    [ObservableProperty]
+    public partial string Currency { get; set; } = "EUR";
+
+    public decimal LineTotal => Count * UnitaryCost;
+
+    public string LineTotalLabel => $"{LineTotal:0.00}";
+}

src/PostIt/PostIt/ViewModels/Activity/EstimateListPageViewModel.cs

@@ -0,0 +1,183 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Avalonia;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using PostIt.Helpers;
+using Yavsc.Api.Client;
+
+namespace PostIt.ViewModels;
+
+/// <summary>
+/// Point de vue d'une liste de devis en cours (non encore validés par
+/// le client).
+/// </summary>
+public enum EstimateListPerspective
+{
+    /// <summary>« Devis en attente de signature client » — l'utilisateur courant est le client.</summary>
+    Client,
+
+    /// <summary>« Devis en attente de signature fournisseur » — l'utilisateur courant est le fournisseur.</summary>
+    Provider,
+}
+
+/// <summary>
+/// Liste des devis en cours servie par <c>GET api/v1/estimate/asclient</c>
+/// ou <c>GET api/v1/estimate/asprovider</c> selon la perspective choisie.
+/// </summary>
+public partial class EstimateListPageViewModel : ViewModelBase, IActionStatusViewModel
+{
+    private readonly EstimateApiClient _estimateClient;
+    private readonly FrontOfficeApiClient _frontClient;
+    private readonly EstimateListPerspective _perspective;
+    private List<EstimateDto> _allEstimates = new();
+
+    public EstimateListPerspective Perspective => _perspective;
+
+    public string Title => _perspective == EstimateListPerspective.Client
+        ? "Devis en attente de signature client"
+        : "Devis en attente de signature fournisseur";
+
+    public string Subtitle => _perspective == EstimateListPerspective.Client
+        ? "Point de vue client"
+        : "Point de vue fournisseur";
+
+    /// <summary>
+    /// Libellé de la colonne « autre partie » : côté client on montre
+    /// le fournisseur (OwnerId), côté fournisseur on montre le client.
+    /// </summary>
+    public string CounterpartLabel => _perspective == EstimateListPerspective.Client
+        ? "Fournisseur"
+        : "Client";
+
+    [ObservableProperty]
+    public partial ObservableCollection<EstimateDto> Estimates { get; set; } = new();
+
+    [ObservableProperty]
+    public partial string FilterText { get; set; } = string.Empty;
+
+    [ObservableProperty]
+    public partial EstimateDto? SelectedEstimate { get; set; }
+
+    [ObservableProperty]
+    public partial bool IsBusy { get; set; }
+
+    [ObservableProperty]
+    public partial string StatusMessage { get; set; } = "Chargement des devis...";
+
+    [ObservableProperty]
+    public partial StatusNotice ActionStatus { get; set; } = StatusNotice.Info("Chargement des devis...");
+
+    public override bool CanNavigateNext
+    {
+        get => false;
+        protected set { _ = value; }
+    }
+
+    public override bool CanNavigatePrevious
+    {
+        get => true;
+        protected set { _ = value; }
+    }
+
+    public EstimateListPageViewModel(
+        EstimateApiClient estimateClient,
+        EstimateListPerspective perspective,
+        FrontOfficeApiClient frontClient)
+    {
+        _estimateClient = estimateClient ?? throw new ArgumentNullException(nameof(estimateClient));
+        _perspective = perspective;
+        _frontClient = frontClient ?? throw new ArgumentNullException(nameof(frontClient));
+    }
+
+    public Task InitializeAsync() => RefreshAsync();
+
+    [RelayCommand]
+    public async Task RefreshAsync()
+    {
+        IsBusy = true;
+        try
+        {
+            var items = (_perspective == EstimateListPerspective.Client
+                ? await _estimateClient.GetOngoingEstimatesAsClientAsync().ConfigureAwait(true)
+                : await _estimateClient.GetOngoingEstimatesAsProviderAsync().ConfigureAwait(true))
+                ?? new List<EstimateDto>();
+
+            _allEstimates = items
+                .OrderByDescending(x => x.Id)
+                .ToList();
+
+            ApplyFilter();
+            this.SetInfoStatus(_allEstimates.Count == 0
+                ? "Aucun devis en cours."
+                : $"{_allEstimates.Count} devis en cours chargé(s).");
+        }
+        catch (HttpRequestException ex) when (ex.StatusCode is HttpStatusCode.Unauthorized or HttpStatusCode.Forbidden)
+        {
+            _allEstimates = new List<EstimateDto>();
+            Estimates = new ObservableCollection<EstimateDto>();
+            this.SetWarningStatus("Accès refusé (scope 'api'). Déconnectez puis reconnectez-vous.");
+        }
+        catch (Exception ex)
+        {
+            _allEstimates = new List<EstimateDto>();
+            Estimates = new ObservableCollection<EstimateDto>();
+            this.SetErrorStatus($"Erreur: {ex.Message}");
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
+    partial void OnFilterTextChanged(string value)
+    {
+        ApplyFilter();
+    }
+
+    private void ApplyFilter()
+    {
+        var query = FilterText?.Trim();
+        var filtered = string.IsNullOrWhiteSpace(query)
+            ? _allEstimates
+            : _allEstimates.Where(x =>
+                    ContainsInsensitive(x.Title, query)
+                    || ContainsInsensitive(x.Description, query)
+                    || ContainsInsensitive(x.CommandType, query)
+                    || ContainsInsensitive(x.ClientId, query)
+                    || ContainsInsensitive(x.OwnerId, query))
+                .ToList();
+
+        Estimates = new ObservableCollection<EstimateDto>(filtered);
+    }
+
+    private static bool ContainsInsensitive(string? value, string query)
+        => !string.IsNullOrWhiteSpace(value)
+           && value.Contains(query, StringComparison.OrdinalIgnoreCase);
+
+    /// <summary>
+    /// Open the estimate validation (accept/reject with signature)
+    /// page for a specific estimate. The perspective the list was
+    /// opened in is forwarded as the actor-role UI hint; the server
+    /// independently enforces the real authorization.
+    /// </summary>
+    [RelayCommand]
+    private async Task OpenEstimateAsync(EstimateDto? estimate)
+    {
+        if (estimate is null) return;
+
+        var app = (App?)Application.Current;
+        if (app is null)
+        {
+            throw new InvalidOperationException("Application PostIt indisponible.");
+        }
+
+        var vm = new EstimateValidationPageViewModel(estimate, _perspective, _frontClient);
+        await app.PushPageAsync(vm).ConfigureAwait(true);
+    }
+}

src/PostIt/PostIt/ViewModels/Activity/EstimateValidationPageViewModel.cs

@@ -0,0 +1,399 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Avalonia;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using PostIt.Controls;
+using PostIt.Helpers;
+using PostIt.Models;
+using Yavsc.Api.Client;
+using Yavsc.Models.Billing;
+
+namespace PostIt.ViewModels;
+
+/// <summary>
+/// Validation (accept / reject) of a single estimate, with optional
+/// signatures. Backs the estimate validation page opened from
+/// <see cref="EstimateListPageViewModel"/> for either perspective.
+///
+/// <para>Two signatures are shown, each in its own pad: the provider's
+/// (Pro) and the client's (Client). Both are rendered from the estimate
+/// payload when present, so reopening a partly-signed estimate shows
+/// what was already captured. Only the pad matching the current
+/// <see cref="EstimateListPerspective"/> is writable — the server
+/// (<c>POST api/v1/front/query/accept</c>) independently enforces the
+/// same rule (it resolves the caller's role from the authenticated user
+/// vs the query's <c>PerformerId</c>/<c>ClientId</c>), and the UI marks
+/// the other pad read-only. The billing code sent to the server is the
+/// estimate's <see cref="EstimateDto.CommandType"/> and the query id is
+/// its <see cref="EstimateDto.CommandId"/>.</para>
+/// </summary>
+public partial class EstimateValidationPageViewModel : ViewModelBase, IActionStatusViewModel
+{
+    private readonly EstimateDto _estimate;
+    private readonly EstimateListPerspective _perspective;
+    private readonly FrontOfficeApiClient _frontClient;
+    private SignaturePadControl? _proPad;
+    private SignaturePadControl? _clientPad;
+
+    public string Title => _estimate.Title;
+    public string Description => _estimate.Description;
+    public long EstimateId => _estimate.Id;
+    public string CommandType => _estimate.CommandType;
+    public IReadOnlyList<EstimateLineDto> Bill => _estimate.Bill;
+    public DateTime ProviderValidationDate => _estimate.ProviderValidationDate;
+    public DateTime ClientValidationDate => _estimate.ClientValidationDate;
+
+    public string RoleLabel => _perspective == EstimateListPerspective.Provider
+        ? "Vous validez en tant que prestataire"
+        : "Vous validez en tant que client";
+
+    /// <summary>
+    /// True when the current user may sign the provider's signature
+    /// (i.e. they opened the list as the provider). The other party's
+    /// pad is read-only.
+    /// </summary>
+    public bool CanWritePro => _perspective == EstimateListPerspective.Provider;
+
+    /// <summary>
+    /// True when the current user may sign the client's signature
+    /// (i.e. they opened the list as the client).
+    /// </summary>
+    public bool CanWriteClient => _perspective == EstimateListPerspective.Client;
+
+    /// <summary>
+    /// Human-readable summary of who has already validated this
+    /// estimate, shown above the signature pads.
+    /// </summary>
+    public string ValidationStateText
+    {
+        get
+        {
+            var parts = new List<string>();
+            if (ProviderValidationDate != default)
+                parts.Add($"Prestataire validé le {ProviderValidationDate.ToLocalTime():g}");
+            if (ClientValidationDate != default)
+                parts.Add($"Client validé le {ClientValidationDate.ToLocalTime():g}");
+            return parts.Count == 0 ? "Devis en attente de validation." : string.Join(" · ", parts);
+        }
+    }
+
+    /// <summary>
+    /// True when the estimate has a linked query to accept/reject.
+    /// Estimates without a <see cref="EstimateDto.CommandId"/> are
+    /// templates and cannot be validated through the front-office
+    /// endpoint.
+    /// </summary>
+    public bool HasCommand => _estimate.CommandId is not null;
+
+    [ObservableProperty]
+    public partial bool IsBusy { get; set; }
+
+    [ObservableProperty]
+    public partial string StatusMessage { get; set; } = "Prêt.";
+
+    [ObservableProperty]
+    public partial StatusNotice ActionStatus { get; set; } = StatusNotice.Info("Prêt.");
+
+    /// <summary>Stroke/point counts for the writable pad.</summary>
+    [ObservableProperty]
+    public partial int StrokeCount { get; set; }
+
+    [ObservableProperty]
+    public partial int PointCount { get; set; }
+
+    /// <summary>True when the writable pad holds a signature.</summary>
+    [ObservableProperty]
+    public partial bool HasSignature { get; set; }
+
+    [ObservableProperty]
+    public partial bool HasProSignature { get; set; }
+
+    [ObservableProperty]
+    public partial bool HasClientSignature { get; set; }
+
+    [ObservableProperty]
+    public partial string ProSignatureHint { get; set; } = string.Empty;
+
+    [ObservableProperty]
+    public partial string ClientSignatureHint { get; set; } = string.Empty;
+
+    public override bool CanNavigateNext
+    {
+        get => false;
+        protected set { _ = value; }
+    }
+
+    public override bool CanNavigatePrevious
+    {
+        get => true;
+        protected set { _ = value; }
+    }
+
+    public EstimateValidationPageViewModel(
+        EstimateDto estimate,
+        EstimateListPerspective perspective,
+        FrontOfficeApiClient frontClient)
+    {
+        _estimate = estimate ?? throw new ArgumentNullException(nameof(estimate));
+        _perspective = perspective;
+        _frontClient = frontClient ?? throw new ArgumentNullException(nameof(frontClient));
+    }
+
+    /// <summary>
+    /// Bind the page's two signature pads (the inner controls of the
+    /// page's <see cref="SignaturePadView"/>s): the provider's pad and
+    /// the client's pad. Called from the view's code-behind once the
+    /// view is in the visual tree. Marks the non-author pad read-only,
+    /// then renders any signatures already carried on the estimate
+    /// payload.
+    /// </summary>
+    public void Attach(SignaturePadControl proPad, SignaturePadControl clientPad)
+    {
+        if (proPad is null) throw new ArgumentNullException(nameof(proPad));
+        if (clientPad is null) throw new ArgumentNullException(nameof(clientPad));
+        Detach();
+        _proPad = proPad;
+        _clientPad = clientPad;
+        _proPad.IsReadOnly = !CanWritePro;
+        _clientPad.IsReadOnly = !CanWriteClient;
+        _proPad.RedrawRequested += OnPadRedraw;
+        _clientPad.RedrawRequested += OnPadRedraw;
+        LoadExistingSignatures();
+        RefreshFromPad();
+    }
+
+    public void Detach()
+    {
+        if (_proPad is not null)
+            _proPad.RedrawRequested -= OnPadRedraw;
+        if (_clientPad is not null)
+            _clientPad.RedrawRequested -= OnPadRedraw;
+        _proPad = null;
+        _clientPad = null;
+    }
+
+    private void OnPadRedraw(object? sender, EventArgs e) => RefreshFromPad();
+
+    /// <summary>The pad the current user may sign in.</summary>
+    private SignaturePadControl? WritablePad => CanWritePro ? _proPad : _clientPad;
+
+    /// <summary>
+    /// Render the signatures already stored for this estimate back into
+    /// their pads. The strokes are carried on the estimate payload as
+    /// two dedicated slots — <see cref="EstimateDto.SignaturePro"/> and
+    /// <see cref="EstimateDto.SignatureClient"/> — so each pad loads
+    /// its own side directly, in the same wire format PostIt captured.
+    /// No network round-trip.
+    /// </summary>
+    public void LoadExistingSignatures()
+    {
+        LoadSide(_proPad, _estimate.SignaturePro);
+        LoadSide(_clientPad, _estimate.SignatureClient);
+        RefreshFromPad();
+    }
+
+    private static void LoadSide(SignaturePadControl? pad, EstimateSignatureDto? sig)
+    {
+        if (pad is null || sig is null) return;
+        if (sig.Strokes is { Length: > 0 } strokes)
+            pad.Load(strokes);
+    }
+
+    private void RefreshFromPad()
+    {
+        HasProSignature = _proPad?.Snapshot().IsEmpty == false;
+        HasClientSignature = _clientPad?.Snapshot().IsEmpty == false;
+
+        ProSignatureHint = CanWritePro
+            ? (HasProSignature ? "Signé — dessinez pour remplacer" : "Signez ici en tant que prestataire")
+            : (HasProSignature ? "Signature du prestataire (lecture seule)" : "En attente de signature du prestataire");
+        ClientSignatureHint = CanWriteClient
+            ? (HasClientSignature ? "Signé — dessinez pour remplacer" : "Signez ici en tant que client")
+            : (HasClientSignature ? "Signature du client (lecture seule)" : "En attente de signature du client");
+
+        var pad = WritablePad;
+        if (pad is null) return;
+        var snap = pad.Snapshot();
+        StrokeCount = snap.StrokeCount;
+        PointCount = snap.PointCount;
+        HasSignature = !snap.IsEmpty;
+    }
+
+    partial void OnIsBusyChanged(bool value)
+    {
+        ValidateCommand.NotifyCanExecuteChanged();
+        RejectCommand.NotifyCanExecuteChanged();
+    }
+
+    partial void OnHasSignatureChanged(bool value)
+        => ValidateCommand.NotifyCanExecuteChanged();
+
+    private bool CanValidate => !IsBusy && HasSignature && HasCommand;
+
+    private bool CanReject => !IsBusy && HasCommand;
+
+    [RelayCommand(CanExecute = nameof(CanValidate))]
+    public async Task ValidateAsync()
+    {
+        if (_estimate.CommandId is not long queryId)
+        {
+            this.SetWarningStatus("Ce devis n'est pas lié à une demande et ne peut être validé.");
+            return;
+        }
+        var pad = WritablePad;
+        if (pad is null || pad.Snapshot().IsEmpty)
+        {
+            this.SetWarningStatus("Veuillez signer avant de valider.");
+            return;
+        }
+
+        var snap = pad.Snapshot();
+        IsBusy = true;
+        try
+        {
+            var body = new QueryAcceptanceRequestDto
+            {
+                Strokes = snap.Strokes,
+                CoordinateMax = SignaturePadData.CoordinateMax,
+                CapturedAtUtc = DateTime.UtcNow,
+                // Declare which side the caller is signing as, so the
+                // server stores the signature under the right author
+                // (Pro/Client) even when one user is both parties.
+                SignatureType = CanWritePro ? SignatureType.Pro : SignatureType.Client,
+            };
+
+            await _frontClient.AcceptQueryAsync(_estimate.CommandType, queryId, body)
+                .ConfigureAwait(true);
+
+            this.SetInfoStatus("Devis validé.");
+            await GoBackAsync().ConfigureAwait(true);
+        }
+        catch (HttpRequestException ex) when (ex.StatusCode is System.Net.HttpStatusCode.Forbidden)
+        {
+            this.SetWarningStatus("Vous n'êtes pas partie à ce devis.");
+        }
+        catch (HttpRequestException ex) when (ex.StatusCode is System.Net.HttpStatusCode.BadRequest)
+        {
+            this.SetWarningStatus($"Validation refusée: {ex.Message}");
+        }
+        catch (Exception ex)
+        {
+            this.SetErrorStatus($"Erreur: {ex.Message}");
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
+    [RelayCommand(CanExecute = nameof(CanReject))]
+    public async Task RejectAsync()
+    {
+        if (_estimate.CommandId is not long queryId)
+        {
+            this.SetWarningStatus("Ce devis n'est pas lié à une demande et ne peut être refusé.");
+            return;
+        }
+
+        IsBusy = true;
+        try
+        {
+            await _frontClient.RejectQueryAsync(_estimate.CommandType, queryId)
+                .ConfigureAwait(true);
+
+            this.SetInfoStatus("Devis refusé.");
+            await GoBackAsync().ConfigureAwait(true);
+        }
+        catch (HttpRequestException ex) when (ex.StatusCode is System.Net.HttpStatusCode.Forbidden)
+        {
+            this.SetWarningStatus("Vous n'êtes pas partie à ce devis.");
+        }
+        catch (Exception ex)
+        {
+            this.SetErrorStatus($"Erreur: {ex.Message}");
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
+    [RelayCommand]
+    public void ClearSignature()
+    {
+        WritablePad?.Clear();
+        RefreshFromPad();
+    }
+
+    /// <summary>
+    /// Download the estimate as a LaTeX source document. The server
+    /// renders the Estimate_tex template to a <c>.tex</c> byte stream
+    /// (<c>GET api/v1/front/query/{CommandId}/estimate.tex</c>); the
+    /// user picks a destination via the platform save picker.
+    /// </summary>
+    [RelayCommand]
+    public async Task DownloadTexAsync()
+    {
+        await DownloadAsync(
+            () => _frontClient.GetEstimateTexAsync(_estimate.CommandId!.Value),
+            $"devis-{EstimateId}", "tex").ConfigureAwait(true);
+    }
+
+    /// <summary>
+    /// Download the estimate as a compiled PDF
+    /// (<c>GET api/v1/front/query/{CommandId}/estimate.pdf</c>).
+    /// Requires <c>texi2pdf</c> on the server host; a failure is
+    /// surfaced as a status message.
+    /// </summary>
+    [RelayCommand]
+    public async Task DownloadPdfAsync()
+    {
+        await DownloadAsync(
+            () => _frontClient.GetEstimatePdfAsync(_estimate.CommandId!.Value),
+            $"devis-{EstimateId}", "pdf").ConfigureAwait(true);
+    }
+
+    private async Task DownloadAsync(Func<Task<byte[]>> fetch, string fileName, string ext)
+    {
+        if (_estimate.CommandId is not long)
+        {
+            this.SetWarningStatus("Ce devis n'est pas lié à une demande.");
+            return;
+        }
+
+        IsBusy = true;
+        try
+        {
+            var bytes = await fetch().ConfigureAwait(true);
+            var saved = await FileSaveHelpers.SaveAsync(fileName, ext, bytes).ConfigureAwait(true);
+            this.SetInfoStatus(saved
+                ? $"Fichier .{ext} enregistré."
+                : "Téléchargement annulé.");
+        }
+        catch (Exception ex)
+        {
+            this.SetErrorStatus($"Échec du téléchargement: {ex.Message}");
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
+    [RelayCommand]
+    private async Task BackAsync() => await GoBackAsync().ConfigureAwait(true);
+
+    private static async Task GoBackAsync()
+    {
+        var app = (App?)Application.Current;
+        if (app is null)
+        {
+            throw new InvalidOperationException("Application PostIt indisponible.");
+        }
+        await app.GoBackAsync().ConfigureAwait(true);
+    }
+}

src/PostIt/PostIt/ViewModels/Activity/ProviderOngoingRequestsPageViewModel.cs

@@ -0,0 +1,395 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Avalonia;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using Microsoft.Extensions.DependencyInjection;
+using PostIt.Helpers;
+using Yavsc;
+using Yavsc.Abstract.Workflow;
+using Yavsc.Api.Client;
+
+namespace PostIt.ViewModels;
+
+public partial class ProviderOngoingRequestsPageViewModel : ViewModelBase, IActionStatusViewModel
+{
+    public const string SortByDate = "Date (plus récent d'abord)";
+    public const string SortByDateAsc = "Date (plus ancien d'abord)";
+    public const string SortByStatus = "Statut (en cours d'abord)";
+
+    private readonly BillingApiClient _billingClient;
+    private readonly EstimateApiClient? _estimateClient;
+    private readonly Settings? _settings;
+    private List<BillingQuerySummaryDto> _allQueries = new();
+
+    [ObservableProperty]
+    public partial ObservableCollection<BillingQuerySummaryDto> Queries { get; set; } = new();
+
+    [ObservableProperty]
+    public partial string FilterText { get; set; } = string.Empty;
+
+    public IReadOnlyList<string> SortOptions { get; } = new[]
+    {
+        SortByDate,
+        SortByDateAsc,
+        SortByStatus,
+    };
+
+    [ObservableProperty]
+    public partial string SelectedSortOption { get; set; } = SortByDate;
+
+    [ObservableProperty, NotifyCanExecuteChangedFor(nameof(OpenSelectedQueryCommand))]
+    [NotifyCanExecuteChangedFor(nameof(OpenSelectedEditorCommand))]
+    [NotifyCanExecuteChangedFor(nameof(CreateEstimateForSelectedCommand))]
+    public partial BillingQuerySummaryDto? SelectedQuery { get; set; }
+
+    [ObservableProperty]
+    public partial bool IsBusy { get; set; }
+
+    [ObservableProperty]
+    public partial string StatusMessage { get; set; } = "Chargement des demandes fournisseur...";
+
+    [ObservableProperty]
+    public partial StatusNotice ActionStatus { get; set; } = StatusNotice.Info("Chargement des demandes fournisseur...");
+
+    public string Title => "Mes demandes en cours";
+
+    public override bool CanNavigateNext
+    {
+        get => false;
+        protected set { _ = value; }
+    }
+
+    public override bool CanNavigatePrevious
+    {
+        get => true;
+        protected set { _ = value; }
+    }
+
+    public ProviderOngoingRequestsPageViewModel(
+        BillingApiClient billingClient,
+        Settings? settings = null,
+        EstimateApiClient? estimateClient = null)
+    {
+        _billingClient = billingClient ?? throw new ArgumentNullException(nameof(billingClient));
+        _estimateClient = estimateClient;
+        _settings = settings;
+
+        if (_settings is not null)
+        {
+            var preferredSort = NormalizeSortOption(_settings.ProviderOngoingRequestsSortOption);
+            if (!string.Equals(preferredSort, SelectedSortOption, StringComparison.Ordinal))
+            {
+                SelectedSortOption = preferredSort;
+            }
+        }
+    }
+
+    public Task InitializeAsync() => RefreshAsync();
+
+    [RelayCommand]
+    public async Task RefreshAsync()
+    {
+        IsBusy = true;
+        try
+        {
+            var items = await _billingClient.GetProviderOngoingQueriesAsync().ConfigureAwait(true) ?? new();
+            _allQueries = items
+                .Where(x => !string.IsNullOrWhiteSpace(x.BillingCode))
+                .OrderByDescending(x => x.EventDate ?? DateTime.MinValue)
+                .ThenByDescending(x => x.Id)
+                .ToList();
+
+            ApplyFilter();
+            this.SetInfoStatus(_allQueries.Count == 0
+                ? "Aucune demande en cours pour votre profil fournisseur."
+                : $"{_allQueries.Count} demande(s) en cours chargée(s).");
+        }
+        catch (HttpRequestException ex) when (ex.StatusCode is HttpStatusCode.Unauthorized or HttpStatusCode.Forbidden)
+        {
+            _allQueries = new List<BillingQuerySummaryDto>();
+            Queries = new ObservableCollection<BillingQuerySummaryDto>();
+            this.SetWarningStatus("Accès refusé au billing (scope 'api'). Déconnectez puis reconnectez-vous.");
+        }
+        catch (Exception ex)
+        {
+            _allQueries = new List<BillingQuerySummaryDto>();
+            Queries = new ObservableCollection<BillingQuerySummaryDto>();
+            this.SetErrorStatus($"Erreur: {ex.Message}");
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
+    private bool CanOpenSelectedQuery() => SelectedQuery is not null;
+
+    private bool CanOpenSelectedEditor() => SelectedQuery is not null;
+
+    [RelayCommand(CanExecute = nameof(CanOpenSelectedQuery))]
+    public async Task OpenSelectedQueryAsync()
+    {
+        if (SelectedQuery is null)
+        {
+            this.SetWarningStatus("Sélectionnez une demande.");
+            return;
+        }
+
+        var app = (App?)Application.Current;
+        if (app is null)
+        {
+            throw new InvalidOperationException("Application PostIt indisponible.");
+        }
+
+        IsBusy = true;
+        try
+        {
+            var details = await _billingClient
+                .GetQueryAsync(SelectedQuery.BillingCode, SelectedQuery.Id)
+                .ConfigureAwait(true);
+            var (activity, performer, form) = BuildNavigationContext(SelectedQuery);
+            var frontClient = app.ServiceProvider?.GetRequiredService<FrontOfficeApiClient>();
+
+            var vm = new BillingQueryDetailsPageViewModel(
+                activity,
+                performer,
+                form,
+                _billingClient,
+                frontClient,
+                details,
+                isReadOnly: false);
+
+            await app.PushPageAsync(vm).ConfigureAwait(true);
+        }
+        catch (Exception ex)
+        {
+            this.SetErrorStatus($"Erreur lors de l'ouverture: {ex.Message}");
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
+    [RelayCommand(CanExecute = nameof(CanOpenSelectedEditor))]
+    public async Task OpenSelectedEditorAsync()
+    {
+        if (SelectedQuery is null)
+        {
+            this.SetWarningStatus("Sélectionnez une demande.");
+            return;
+        }
+
+        var app = (App?)Application.Current;
+        if (app is null)
+        {
+            throw new InvalidOperationException("Application PostIt indisponible.");
+        }
+
+        IsBusy = true;
+        try
+        {
+            var details = await _billingClient
+                .GetQueryAsync(SelectedQuery.BillingCode, SelectedQuery.Id)
+                .ConfigureAwait(true);
+
+            var (activity, performer, form) = BuildNavigationContext(SelectedQuery);
+            var vm = form.CreateCommandPageViewModel(activity, performer, _billingClient);
+            if (vm is null)
+            {
+                this.SetWarningStatus($"Le formulaire '{form.ActionName}' n'est pas pris en charge en édition.");
+                return;
+            }
+
+            await vm.InitializeAsync(details).ConfigureAwait(true);
+            await app.PushPageAsync(vm).ConfigureAwait(true);
+        }
+        catch (Exception ex)
+        {
+            this.SetErrorStatus($"Erreur lors de l'ouverture en édition: {ex.Message}");
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
+    private bool CanCreateEstimateForSelected() => SelectedQuery is not null && _estimateClient is not null;
+
+    [RelayCommand(CanExecute = nameof(CanCreateEstimateForSelected))]
+    public async Task CreateEstimateForSelectedAsync()
+    {
+        if (SelectedQuery is null)
+        {
+            this.SetWarningStatus("Sélectionnez une demande.");
+            return;
+        }
+
+        if (_estimateClient is null)
+        {
+            this.SetWarningStatus("Le client devis n'est pas disponible.");
+            return;
+        }
+
+        var app = (App?)Application.Current;
+        if (app is null)
+        {
+            throw new InvalidOperationException("Application PostIt indisponible.");
+        }
+
+        var vm = new EstimateEditionPageViewModel(SelectedQuery, _estimateClient);
+        await app.PushPageAsync(vm).ConfigureAwait(true);
+    }
+
+    partial void OnFilterTextChanged(string value)
+    {
+        ApplyFilter();
+    }
+
+    partial void OnSelectedSortOptionChanged(string value)
+    {
+        var normalized = NormalizeSortOption(value);
+        if (!string.Equals(normalized, value, StringComparison.Ordinal))
+        {
+            SelectedSortOption = normalized;
+            return;
+        }
+
+        PersistSortPreference(value);
+        ApplyFilter();
+    }
+
+    private void ApplyFilter()
+    {
+        var query = FilterText?.Trim();
+        var filtered = string.IsNullOrWhiteSpace(query)
+            ? _allQueries
+            : _allQueries.Where(x =>
+                    ContainsInsensitive(x.Description, query)
+                    || ContainsInsensitive(x.ActivityCode, query)
+                    || ContainsInsensitive(x.BillingCode, query)
+                    || ContainsInsensitive(x.ClientId, query)
+                    || ContainsInsensitive(x.Status.ToString(), query))
+                .ToList();
+
+        var sorted = ApplySort(filtered);
+        Queries = new ObservableCollection<BillingQuerySummaryDto>(sorted);
+    }
+
+    private List<BillingQuerySummaryDto> ApplySort(IEnumerable<BillingQuerySummaryDto> source)
+    {
+        if (string.Equals(SelectedSortOption, SortByStatus, StringComparison.Ordinal))
+        {
+            return source
+                .OrderBy(x => GetStatusRank(x.Status))
+                .ThenByDescending(x => x.EventDate ?? DateTime.MinValue)
+                .ThenByDescending(x => x.Id)
+                .ToList();
+        }
+
+            if (string.Equals(SelectedSortOption, SortByDateAsc, StringComparison.Ordinal))
+            {
+                return source
+                .OrderBy(x => x.EventDate ?? DateTime.MinValue)
+                .ThenBy(x => x.Id)
+                .ToList();
+            }
+
+        return source
+            .OrderByDescending(x => x.EventDate ?? DateTime.MinValue)
+            .ThenByDescending(x => x.Id)
+            .ToList();
+    }
+
+    private void PersistSortPreference(string selectedSort)
+    {
+        if (_settings is null)
+        {
+            return;
+        }
+
+        if (string.Equals(_settings.ProviderOngoingRequestsSortOption, selectedSort, StringComparison.Ordinal))
+        {
+            return;
+        }
+
+        _settings.ProviderOngoingRequestsSortOption = selectedSort;
+
+        try
+        {
+            _settings.Save();
+        }
+        catch
+        {
+            this.SetWarningStatus("Le tri a été appliqué, mais sa sauvegarde a échoué.");
+        }
+    }
+
+    private static string NormalizeSortOption(string? sortOption)
+    {
+        if (string.Equals(sortOption, SortByDate, StringComparison.Ordinal)
+            || string.Equals(sortOption, SortByDateAsc, StringComparison.Ordinal)
+            || string.Equals(sortOption, SortByStatus, StringComparison.Ordinal))
+        {
+            return sortOption!;
+        }
+
+        return SortByDate;
+    }
+
+    private static int GetStatusRank(QueryStatus status)
+        => status switch
+        {
+            QueryStatus.InProgress => 0,
+            QueryStatus.ClientAccepted => 1,
+            QueryStatus.ProAccepted => 2,
+            QueryStatus.Accepted => 2,
+            QueryStatus.Inserted => 3,
+            QueryStatus.Success => 4,
+            QueryStatus.Rejected => 5,
+            QueryStatus.Failed => 6,
+            _ => 99,
+        };
+
+    private static bool ContainsInsensitive(string? source, string query)
+        => !string.IsNullOrWhiteSpace(source)
+           && source.Contains(query, StringComparison.OrdinalIgnoreCase);
+
+    private static (ActivityInfo activity, ActivityUserDisplayItem performer, CommandFormSummary form)
+        BuildNavigationContext(BillingQuerySummaryDto query)
+    {
+        var activity = new ActivityInfo
+        {
+            Code = query.ActivityCode,
+            Name = string.IsNullOrWhiteSpace(query.ActivityCode)
+                ? "Activité"
+                : query.ActivityCode,
+        };
+
+        var performer = new ActivityUserDisplayItem
+        {
+            PerformerId = query.PerformerId,
+            UserName = "Mon profil fournisseur",
+            AvatarFallbackLabel = "M",
+            IsPerformerActive = true,
+            PerformerStatusBadgeLabel = "Actif",
+            PerformerStatusBadgeBackground = "#E6F7EC",
+            PerformerStatusBadgeBorder = "#2E7D32",
+            PerformerStatusBadgeForeground = "#1B5E20",
+        };
+
+        var form = new CommandFormSummary
+        {
+            ActionName = query.BillingCode,
+            Title = query.BillingCode,
+        };
+
+        return (activity, performer, form);
+    }
+}

src/PostIt/PostIt/ViewModels/Blogs/BlogsViewModel.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.ObjectModel;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using Avalonia;
@@ -8,11 +9,13 @@ using CommunityToolkit.Mvvm.Input;
 using Microsoft.Extensions.DependencyInjection;
 using Yavsc.Blogspot;
 using Yavsc.Api.Client;
+using Yavsc.Abstract.Files;
 using PostIt.Helpers;
+using AvaloniaEdit.Document;
 
 namespace PostIt.ViewModels;
 
-public partial class MainViewModel : ViewModelBase, IActionStatusViewModel
+public partial class BlogsViewModel : ViewModelBase, IActionStatusViewModel
 {
     /// <summary>Window/tab title. Cosmetic — bound by
     /// <c>MainPage.axaml</c> if at all. Not the post title.</summary>
@@ -34,8 +37,19 @@ public partial class MainViewModel : ViewModelBase, IActionStatusViewModel
 
     /// <summary>Editor buffer for the post body. Same pattern as
     /// <see cref="DraftTitle"/>.</summary>
+
+    public string DraftArticle
+     {
+        get => DraftArticleDocument.Text;
+        set  {
+            OnPropertyChanging(nameof(DraftArticle));
+            DraftArticleDocument = new TextDocument(value);
+            this.OnPropertyChanged(nameof(DraftArticle));
+        }
+     }
+
     [ObservableProperty]
-    public partial string DraftArticle { get; set; }
+    public partial TextDocument DraftArticleDocument {get; set;}
 
     /// <summary>Editor buffer for the post's publication state.
     /// Reflects the server-side <c>IsPublished</c> flag (the
@@ -66,6 +80,9 @@ public partial class MainViewModel : ViewModelBase, IActionStatusViewModel
     [ObservableProperty]
     public partial ObservableCollection<BlogPostDto> FilteredPosts { get; set; }
 
+    [ObservableProperty]
+    public partial ObservableCollection<BlogUploadFile> DraftAttachments { get; set; }
+
     [ObservableProperty]
     public partial BlogPostDto? SelectedPost { get; set; }
 
@@ -75,6 +92,9 @@ public partial class MainViewModel : ViewModelBase, IActionStatusViewModel
     [ObservableProperty]
     public partial Settings Settings { get; private set; }
 
+    [ObservableProperty]
+    public partial bool IsMarkdownViewerVisible { get; set; }
+
     [RelayCommand]
     internal async Task RefreshAsync()
     {
@@ -91,12 +111,6 @@ public partial class MainViewModel : ViewModelBase, IActionStatusViewModel
         });
     }
 
-    [RelayCommand]
-    internal async Task SearchAsync() {
-        await RefreshAsync();
-        ApplyFilter();
-    }
-
     [RelayCommand]
     internal async Task SaveAsync()
     {
@@ -113,9 +127,11 @@ public partial class MainViewModel : ViewModelBase, IActionStatusViewModel
 
         await ExecuteAsync(async () =>
         {
+            var attachments = DraftAttachments.ToArray();
+
             // Build a fresh BlogPostDto from the editor buffer on
             // every Save — we no longer mutate SelectedPost in
-            // place. The previous behaviour copied the buffer
+            // place. The previous behavior copied the buffer
             // (which was a no-op when SelectedPost was null)
             // back onto the model and relied on a
             // [Required] violation to surface the missing
@@ -133,15 +149,33 @@ public partial class MainViewModel : ViewModelBase, IActionStatusViewModel
                     DateModified = DateTime.UtcNow,
                     IsPublished = DraftIsPublished
                 };
-                var created = await BlogClient!.CreatePostAsync(draft);
+                var created = await BlogClient!.CreatePostAsync(draft, attachments);
                 if (created is not null)
                 {
                     SelectedPost = created;
+
+                    if (TryAppendAttachmentLinks(created, attachments))
+                    {
+                        var linkUpdate = new BlogPostDto
+                        {
+                            Id = created.Id,
+                            AuthorId = created.AuthorId,
+                            Photo = created.Photo,
+                            Title = DraftTitle,
+                            Article = DraftArticle ?? string.Empty,
+                            DateCreated = created.DateCreated,
+                            DateModified = DateTime.UtcNow,
+                        };
+                        await BlogClient.UpdatePostAsync(created.Id, linkUpdate);
+                    }
+
                     this.SetInfoStatus($"Billet {created.Id} créé.");
+                    DraftAttachments.Clear();
                 }
             }
             else
             {
+                TryAppendAttachmentLinks(SelectedPost, attachments);
                 var update = new BlogPostDto
                 {
                     Id = SelectedPost.Id,
@@ -152,8 +186,9 @@ public partial class MainViewModel : ViewModelBase, IActionStatusViewModel
                     DateCreated = SelectedPost.DateCreated,
                     DateModified = DateTime.UtcNow,
                 };
-                await BlogClient!.UpdatePostAsync(SelectedPost.Id, update);
+                await BlogClient!.UpdatePostAsync(SelectedPost.Id, update, attachments);
                 this.SetInfoStatus($"Billet {SelectedPost.Id} enregistré.");
+                DraftAttachments.Clear();
             }
 
             await RefreshPostsAsync();
@@ -336,8 +371,9 @@ public partial class MainViewModel : ViewModelBase, IActionStatusViewModel
     }
 
 
-    public MainViewModel()
+    public BlogsViewModel()
     {
+        WindowTitle = "Blog";
         SettingsModel = new Settings();
         Init(SettingsModel);
         BlogClient = null;
@@ -347,14 +383,17 @@ public partial class MainViewModel : ViewModelBase, IActionStatusViewModel
     {
         Posts = new ObservableCollection<BlogPostDto>();
         FilteredPosts = new ObservableCollection<BlogPostDto>();
+        DraftAttachments = new ObservableCollection<BlogUploadFile>();
         SelectedPost = null;
         IsBusy = false;
         this.SetInfoStatus("Prêt.");
         Settings = settings ?? new Settings();
         SearchText = Settings.SearchText;
+        IsMarkdownViewerVisible = false;
         WindowTitle = "PostIt";
         DraftTitle = string.Empty;
         DraftArticle = string.Empty;
+
         DraftIsPublished = false;
         IsLoaded = false;
         // Production path: DI injects the canonical Settings singleton
@@ -396,8 +435,9 @@ public partial class MainViewModel : ViewModelBase, IActionStatusViewModel
     /// <see cref="BlogApiClient"/>. Production code uses the
     /// (Settings, BlogApiClient) overload below.
     /// </summary>
-    public MainViewModel(BlogApiClient blogClient, Settings? settings = null, IServiceProvider? services = null)
+    public BlogsViewModel(BlogApiClient blogClient, Settings? settings = null, IServiceProvider? services = null)
     {
+        WindowTitle = "Blog";
         SettingsModel = new Settings();
         BlogClient = blogClient ?? throw new ArgumentNullException(nameof(blogClient)); ;
         Services = services;
@@ -427,6 +467,7 @@ public partial class MainViewModel : ViewModelBase, IActionStatusViewModel
         // Mirror publication state too. Defaults to false on
         // null selection so a fresh draft starts unpublished.
         DraftIsPublished = value?.IsPublished ?? false;
+        DraftAttachments.Clear();
         UpdateCommandStates();
     }
 
@@ -436,7 +477,6 @@ public partial class MainViewModel : ViewModelBase, IActionStatusViewModel
     // enable as soon as the user has typed a non-whitespace
     // title, regardless of whether a post is selected.
     partial void OnDraftTitleChanged(string value) => SaveCommand.NotifyCanExecuteChanged();
-    partial void OnDraftArticleChanged(string value) => SaveCommand.NotifyCanExecuteChanged();
 
 
     private async Task RefreshPostsAsync()
@@ -508,4 +548,55 @@ public partial class MainViewModel : ViewModelBase, IActionStatusViewModel
             IsLoaded = true;
         }
     }
+
+    private bool TryAppendAttachmentLinks(BlogPostDto post, IReadOnlyCollection<BlogUploadFile> attachments)
+    {
+        if (attachments.Count == 0)
+            return false;
+
+        var ownerSegment = post.Author?.UserName;
+        if (string.IsNullOrWhiteSpace(ownerSegment))
+            ownerSegment = post.AuthorId;
+
+        if (string.IsNullOrWhiteSpace(ownerSegment))
+            return false;
+
+        var article = DraftArticle ?? string.Empty;
+        var links = new List<string>();
+
+        foreach (var attachment in attachments)
+        {
+            var relativePath = $"{EscapePathSegment(ownerSegment)}/blogs/{post.Id}/{EscapePathSegment(attachment.FileName)}";
+            var fileUrl = ResolveUserFileUrl(relativePath);
+            var markdownLine = $"- [{attachment.FileName}]({fileUrl})";
+
+            if (!article.Contains(markdownLine, StringComparison.Ordinal))
+                links.Add(markdownLine);
+        }
+
+        if (links.Count == 0)
+            return false;
+
+        var prefix = article.Length == 0
+            ? ""
+            : (article.EndsWith("\n", StringComparison.Ordinal) ? "\n" : "\n\n");
+
+        DraftArticle = article + prefix + string.Join("\n", links);
+        return true;
+    }
+
+    private string ResolveUserFileUrl(string relativePath)
+    {
+        var authority = Settings?.Authentication?.Authority;
+        if (!string.IsNullOrWhiteSpace(authority)
+            && Uri.TryCreate(authority, UriKind.Absolute, out var baseUri))
+        {
+            return FileServerUrlHelpers.GetUserFilesUri(baseUri, relativePath).ToString();
+        }
+
+        return $"{Yavsc.Constants.UserFilesPath}/{relativePath}";
+    }
+
+    private static string EscapePathSegment(string segment)
+        => Uri.EscapeDataString(segment);
 }

src/PostIt/PostIt/ViewModels/Commands/RdvViewModel.cs

@@ -12,6 +12,9 @@ namespace PostIt.ViewModels.Commands;
 
 public partial class RdvViewModel : BillingCommandPageViewModel
 {
+    private long? _existingLocationId;
+    private bool _hydratingExistingQuery;
+
     public override string SupportMessage => "Complétez les informations du rendez-vous puis postez la commande.";
 
     [ObservableProperty]
@@ -56,6 +59,7 @@ public partial class RdvViewModel : BillingCommandPageViewModel
 
     protected override void ApplyExistingQuery(BillingQueryDetailsDto existingQuery)
     {
+        _hydratingExistingQuery = true;
         ExistingQueryId = existingQuery.Id;
         CommandStatus = existingQuery.Status;
         Consent = existingQuery.Consent;
@@ -70,11 +74,18 @@ public partial class RdvViewModel : BillingCommandPageViewModel
 
         if (existingQuery.Location is not null)
         {
+            _existingLocationId = existingQuery.Location.Id;
             Address = existingQuery.Location.Address ?? string.Empty;
             SuggestedAddress = string.Empty;
             Latitude = existingQuery.Location.Latitude;
             Longitude = existingQuery.Location.Longitude;
         }
+        else
+        {
+            _existingLocationId = null;
+        }
+
+        _hydratingExistingQuery = false;
 
         this.SetInfoStatus($"Commande #{existingQuery.Id} chargée.");
     }
@@ -117,20 +128,22 @@ public partial class RdvViewModel : BillingCommandPageViewModel
         }
     }
 
-    protected static object BuildLocationPayload(string address, double? latitude, double? longitude)
+    protected static BillingLocationDto BuildLocationPayload(string address, double? latitude, double? longitude, long? locationId = null)
     {
         if (latitude.HasValue && longitude.HasValue)
         {
-            return new
+            return new BillingLocationDto
             {
+                Id = locationId,
                 Address = address,
                 Latitude = latitude.Value,
                 Longitude = longitude.Value,
             };
         }
 
-        return new
+        return new BillingLocationDto
         {
+            Id = locationId,
             Address = address,
         };
     }
@@ -223,6 +236,30 @@ public partial class RdvViewModel : BillingCommandPageViewModel
         OnPropertyChanged(nameof(EventDateSelection));
     }
 
+    partial void OnAddressChanged(string value)
+    {
+        if (_hydratingExistingQuery)
+            return;
+
+        _existingLocationId = null;
+    }
+
+    partial void OnLatitudeChanged(double? value)
+    {
+        if (_hydratingExistingQuery)
+            return;
+
+        _existingLocationId = null;
+    }
+
+    partial void OnLongitudeChanged(double? value)
+    {
+        if (_hydratingExistingQuery)
+            return;
+
+        _existingLocationId = null;
+    }
+
 
     protected override async Task SubmitAsync()
     {
@@ -257,7 +294,7 @@ public partial class RdvViewModel : BillingCommandPageViewModel
         try
         {
             var address = Address.Trim();
-            var locationPayload = BuildLocationPayload(address, Latitude, Longitude);
+            var locationPayload = BuildLocationPayload(address, Latitude, Longitude, IsEditingExisting ? _existingLocationId : null);
 
             var payload = new BillingQueryDetailsDto
             {
@@ -270,12 +307,7 @@ public partial class RdvViewModel : BillingCommandPageViewModel
                 Status = CommandStatus,
                 Reason = Reason.Trim(),
                 AdditionalInfo = string.IsNullOrWhiteSpace(AdditionalInfo) ? string.Empty : AdditionalInfo.Trim(),
-                Location = new BillingLocationDto
-                {
-                    Address = address,
-                    Latitude = Latitude,
-                    Longitude = Longitude,
-                }
+                Location = locationPayload
             };
 
             if (IsEditingExisting)

src/PostIt/PostIt/ViewModels/HomePageViewModel.cs

@@ -1,64 +0,0 @@
-using System;
-using System.Threading.Tasks;
-using Avalonia;
-using CommunityToolkit.Mvvm.Input;
-using Microsoft.Extensions.DependencyInjection;
-using PostIt.Helpers;
-using PostIt.Services;
-namespace PostIt.ViewModels;
-
-public class HomePageViewModel : ViewModelBase
-{
-    public YavscApiClient Api { get; }
-    public Settings Settings { get; }
-    public SessionStatusViewModel SessionStatus { get; }
-
-    private string _welcomeText = "Welcome to PostIt!";
-    public string WelcomeText
-    {
-        get => _welcomeText;
-        set => SetProperty(ref _welcomeText, value);
-    }
-
-    public override bool CanNavigateNext { get => true; protected set => throw new System.NotImplementedException(); }
-    public override bool CanNavigatePrevious { get => false; protected set => throw new System.NotImplementedException(); }
-
-    public HomePageViewModel(YavscApiClient api, Settings settings, SessionStatusViewModel sessionStatus)
-    {
-        Api = api;
-        Settings = settings;
-        SessionStatus = sessionStatus;
-
-        OpenActivities = new AsyncRelayCommand(OpenActivitiesAsync);
-
-    }
-    public IAsyncRelayCommand OpenBlogs { get; } = new AsyncRelayCommand(App.PushBlogsPageAsync);
-    public IAsyncRelayCommand OpenActivities { get; }
-
-    private async Task OpenActivitiesAsync()
-    {
-        var app = (App?)Application.Current;
-        var vm = app?.ServiceProvider?.GetRequiredService<ActivitiesPageViewModel>();
-        if (app is null || vm is null)
-        {
-            throw new InvalidOperationException("Activities page is not available.");
-        }
-
-        await vm.RefreshAsync();
-        await app.PushPageAsync(vm);
-    }
-
-    /// <summary>
-    /// Avalonia designer constructor. Builds a self-contained VM
-    /// with a freshly-constructed Settings so the XAML preview can
-    /// render without a running App. Production paths always reach
-    /// the parameterised constructor (DI or direct injection), and
-    /// the postit://callback crash is fixed at the Settings layer
-    /// (thread-safe dispatcher marshalling on PropertyChanged) — a
-    /// designer-only duplicate instance is therefore harmless.
-    /// </summary>
-    public HomePageViewModel() : this(null!, new Settings(), new SessionStatusViewModel())
-    {
-
-    }
-}

src/PostIt/PostIt/ViewModels/Layout/HomePageViewModel.cs

@@ -0,0 +1,117 @@
+using System;
+using System.Threading.Tasks;
+using Avalonia;
+using CommunityToolkit.Mvvm.Input;
+using Microsoft.Extensions.DependencyInjection;
+using PostIt.Helpers;
+using PostIt.Services;
+using Yavsc.Api.Client;
+namespace PostIt.ViewModels;
+
+public class HomePageViewModel : ViewModelBase
+{
+    public YavscApiClient Api { get; }
+    public Settings Settings { get; }
+    public SessionStatusViewModel SessionStatus { get; }
+
+    private string _welcomeText = "Welcome to PostIt!";
+    public string WelcomeText
+    {
+        get => _welcomeText;
+        set => SetProperty(ref _welcomeText, value);
+    }
+
+    public override bool CanNavigateNext { get => true; protected set => throw new System.NotImplementedException(); }
+    public override bool CanNavigatePrevious { get => false; protected set => throw new System.NotImplementedException(); }
+
+    public HomePageViewModel(YavscApiClient api, Settings settings, SessionStatusViewModel sessionStatus)
+    {
+        Api = api;
+        Settings = settings;
+        SessionStatus = sessionStatus;
+
+        OpenActivities = new AsyncRelayCommand(OpenActivitiesAsync);
+        OpenProviderRequests = new AsyncRelayCommand(OpenProviderRequestsAsync);
+        OpenClientEstimates = new AsyncRelayCommand(() => OpenEstimateListAsync(EstimateListPerspective.Client));
+        OpenProviderEstimates = new AsyncRelayCommand(() => OpenEstimateListAsync(EstimateListPerspective.Provider));
+        OpenBlogs = new AsyncRelayCommand(App.PushBlogsPageAsync);
+    }
+    public IAsyncRelayCommand OpenBlogs { get; }
+    public IAsyncRelayCommand OpenActivities { get; }
+    public IAsyncRelayCommand OpenProviderRequests { get; }
+    public IAsyncRelayCommand OpenClientEstimates { get; }
+    public IAsyncRelayCommand OpenProviderEstimates { get; }
+
+    private async Task OpenActivitiesAsync()
+    {
+        var app = (App?)Application.Current;
+        var vm = app?.ServiceProvider?.GetRequiredService<ActivitiesPageViewModel>();
+        if (app is null || vm is null)
+        {
+            throw new InvalidOperationException("Activities page is not available.");
+        }
+
+        await vm.RefreshAsync();
+        await app.PushPageAsync(vm);
+    }
+
+    private async Task OpenProviderRequestsAsync()
+    {
+        var app = (App?)Application.Current;
+        if (app is null)
+        {
+            throw new InvalidOperationException("Application PostIt indisponible.");
+        }
+
+        var billingClient = app.ServiceProvider?.GetRequiredService<BillingApiClient>();
+        if (billingClient is null)
+        {
+            throw new InvalidOperationException("Client billing indisponible.");
+        }
+
+        var estimateClient = app.ServiceProvider?.GetRequiredService<EstimateApiClient>();
+
+        var vm = new ProviderOngoingRequestsPageViewModel(billingClient, Settings, estimateClient);
+        await vm.InitializeAsync();
+        await app.PushPageAsync(vm);
+    }
+
+    private async Task OpenEstimateListAsync(EstimateListPerspective perspective)
+    {
+        var app = (App?)Application.Current;
+        if (app is null)
+        {
+            throw new InvalidOperationException("Application PostIt indisponible.");
+        }
+
+        var estimateClient = app.ServiceProvider?.GetRequiredService<EstimateApiClient>();
+        if (estimateClient is null)
+        {
+            throw new InvalidOperationException("Client devis indisponible.");
+        }
+
+        var frontClient = app.ServiceProvider?.GetRequiredService<FrontOfficeApiClient>();
+        if (frontClient is null)
+        {
+            throw new InvalidOperationException("Client front-office indisponible.");
+        }
+
+        var vm = new EstimateListPageViewModel(estimateClient, perspective, frontClient);
+        await vm.InitializeAsync();
+        await app.PushPageAsync(vm);
+    }
+
+    /// <summary>
+    /// Avalonia designer constructor. Builds a self-contained VM
+    /// with a freshly-constructed Settings so the XAML preview can
+    /// render without a running App. Production paths always reach
+    /// the parameterised constructor (DI or direct injection), and
+    /// the postit://callback crash is fixed at the Settings layer
+    /// (thread-safe dispatcher marshalling on PropertyChanged) — a
+    /// designer-only duplicate instance is therefore harmless.
+    /// </summary>
+    public HomePageViewModel() : this(null!, new Settings(), new SessionStatusViewModel())
+    {
+
+    }
+}

src/PostIt/PostIt/ViewModels/Layout/StatusNotice.cs

@@ -23,8 +23,8 @@ public sealed class StatusNotice
 
         (Glyph, Background, BorderBrush, Foreground) = severity switch
         {
-            StatusSeverity.Error => ("!", "#FDECEA", "#C62828", "#7F1D1D"),
-            StatusSeverity.Warning => ("~", "#FFF8E1", "#E6A700", "#7C4A03"),
+            StatusSeverity.Error => ("!", "#7F1D1D", "#C62828", "#e1f0f6"),
+            StatusSeverity.Warning => ("~", "#7C4A03", "#E6A700", "#eaeaea"),
             _ => ("i", "#E8F0FE", "#5B8DEF", "#1E3A8A"),
         };
     }

src/PostIt/PostIt/ViewModels/Settings/AuthenticationSettings.cs

@@ -22,7 +22,7 @@ public partial class AuthenticationSettings : ObservableObject
 
     public const string DefaultClientId  = "postit";
 
-    public static readonly string[] DefaultScopes  = { "blogs" };
+    public static readonly string[] DefaultScopes  = { "blogs", "api" };
 
     [ObservableProperty]
     public partial string Authority { get; set; }

src/PostIt/PostIt/ViewModels/Settings/Settings.cs

@@ -15,7 +15,8 @@ namespace PostIt.ViewModels;
 
 public partial class Settings : ViewModelBase
 {
-    const string SettingsFileName = "postit-settings.json";
+    [JsonIgnore]
+    public string? SettingsFileFullName { get; private set; }
 
     [ObservableProperty]
     public partial AuthenticationSettings Authentication { get; set; } = new();
@@ -32,10 +33,70 @@ public partial class Settings : ViewModelBase
     [ObservableProperty]
     public partial string SearchText { get; set; } = string.Empty;
 
+    [ObservableProperty]
+    public partial bool IsMarkdownViewerVisible { get; set; } = false;
+
+    [ObservableProperty]
+    public partial string ProviderOngoingRequestsSortOption { get; set; } = string.Empty;
+
     [ObservableProperty]
     [JsonIgnore]
     public partial StatusNotice ActionStatus { get; set; } = StatusNotice.Info("Pret.");
 
+
+    public bool Loaded { get; private set; } = false;
+
+
+    /// <summary>
+    /// True when the in-memory state has drifted from the last
+    /// <see cref="Load"/> or <see cref="Save"/> snapshot. The
+    /// Settings page binds the Sauver button's <c>IsEnabled</c> to
+    /// this flag, so it only enables when the user has actually
+    /// touched something since the last load / save. Cleared by
+    /// <see cref="Load"/> (and by <see cref="ApplyJson"/>), set by
+    /// every successful setter on the four top-level mutable
+    /// properties and on the sub-properties of
+    /// <see cref="Authentication"/>.
+    /// </summary>
+    [ObservableProperty]
+    public partial bool IsDirty { get; private set; } = false;
+
+
+    /// <summary>
+    /// Guards every mutation of the observable state. <c>[ObservableProperty]</c>
+    /// generates setters that call <c>SetProperty(...)</c> which fires
+    /// <c>PropertyChanged</c>. Avalonia bindings consume that event on
+    /// the UI thread, and a stray background-thread update is exactly
+    /// what crashed <c>DataValidationErrors.SetErrors</c> on
+    /// <c>postit://callback</c> re-launches. The lock makes mutations
+    /// atomic; <see cref="OnPropertyChanged(PropertyChangedEventArgs)"/>
+    /// then marshals the notification onto the UI thread so bindings
+    /// observe the change on the right thread.
+    /// </summary>
+    private readonly object _mutationGate = new();
+
+    /// <summary>
+    /// Scopes the PostIt client always requires from the OIDC provider,
+    /// regardless of what the user has in their settings file.
+    ///
+    /// <para>PostIt calls into the Blog API (and any other Yavsc API
+    /// gated by an <c>[Authorize("…Scope")]</c> policy) and is silent
+    /// about the contract: a missing scope here surfaces as a 401
+    /// on the very first API call after login, with no obvious link
+    /// to the settings. The "feature" scopes the user must opt into
+    /// (e.g. <c>blogs</c>) are still their choice — we only force the
+    /// structural ones that OIDC itself needs.</para>
+    /// </summary>
+    private static readonly string[] BuiltInScopes = new[]
+    {
+        "openid",        // OIDC: required for the id_token
+        "profile",       // OIDC: standard profile claims
+        "offline_access", // OIDC: required to receive a refresh_token
+        "blogs",
+        "api"
+    };
+    private readonly string DEFAULT_SETTINGS_FILENAME = "postit-settings.json";
+
     public void SetActionStatus(string message, StatusSeverity severity = StatusSeverity.Info)
     {
         ActionStatus = severity switch
@@ -62,6 +123,7 @@ public partial class Settings : ViewModelBase
     partial void OnBlogsApiUrlChanged(string value) => MarkDirty();
     partial void OnApiUrlChanged(string value) => MarkDirty();
     partial void OnSearchTextChanged(string value) => MarkDirty();
+    partial void OnProviderOngoingRequestsSortOptionChanged(string value) => MarkDirty();
 
     /// <summary>
     /// Authentication can be reassigned wholesale by
@@ -82,35 +144,6 @@ public partial class Settings : ViewModelBase
         MarkDirty();
     }
 
-    public bool Loaded { get; private set; } = false;
-
-    /// <summary>
-    /// True when the in-memory state has drifted from the last
-    /// <see cref="Load"/> or <see cref="Save"/> snapshot. The
-    /// Settings page binds the Sauver button's <c>IsEnabled</c> to
-    /// this flag, so it only enables when the user has actually
-    /// touched something since the last load / save. Cleared by
-    /// <see cref="Load"/> (and by <see cref="ApplyJson"/>), set by
-    /// every successful setter on the four top-level mutable
-    /// properties and on the sub-properties of
-    /// <see cref="Authentication"/>.
-    /// </summary>
-    [ObservableProperty]
-    public partial bool IsDirty { get; private set; } = false;
-
-    /// <summary>
-    /// Guards every mutation of the observable state. <c>[ObservableProperty]</c>
-    /// generates setters that call <c>SetProperty(...)</c> which fires
-    /// <c>PropertyChanged</c>. Avalonia bindings consume that event on
-    /// the UI thread, and a stray background-thread update is exactly
-    /// what crashed <c>DataValidationErrors.SetErrors</c> on
-    /// <c>postit://callback</c> re-launches. The lock makes mutations
-    /// atomic; <see cref="OnPropertyChanged(PropertyChangedEventArgs)"/>
-    /// then marshals the notification onto the UI thread so bindings
-    /// observe the change on the right thread.
-    /// </summary>
-    private readonly object _mutationGate = new();
-
     /// <summary>
     /// Build OidcClient options configured for Authorization Code + PKCE
     /// (no client secret). The browser implementation should be supplied
@@ -174,27 +207,6 @@ public partial class Settings : ViewModelBase
         Authentication.RefreshScopeListText();
     }
 
-    /// <summary>
-    /// Scopes the PostIt client always requires from the OIDC provider,
-    /// regardless of what the user has in their settings file.
-    ///
-    /// <para>PostIt calls into the Blog API (and any other Yavsc API
-    /// gated by an <c>[Authorize("…Scope")]</c> policy) and is silent
-    /// about the contract: a missing scope here surfaces as a 401
-    /// on the very first API call after login, with no obvious link
-    /// to the settings. The "feature" scopes the user must opt into
-    /// (e.g. <c>blogs</c>) are still their choice — we only force the
-    /// structural ones that OIDC itself needs.</para>
-    /// </summary>
-    private static readonly string[] BuiltInScopes = new[]
-    {
-        "openid",        // OIDC: required for the id_token
-        "profile",       // OIDC: standard profile claims
-        "offline_access", // OIDC: required to receive a refresh_token
-        "blogs",
-        "api"
-
-    };
 
     /// <summary>
     /// Merge user-configured scopes with the built-in ones. User scopes
@@ -248,15 +260,37 @@ public partial class Settings : ViewModelBase
             }
         }
 
-        string configDir = Path.Combine(
-    Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
-    "PostIt"
-);
-        Directory.CreateDirectory(configDir);
+        var app = App.Current as App;
+        if (app!=null)
+        if (app.CliConfigFileSpecification!=null)
+        {
+            SettingsFileFullName = app.CliConfigFileSpecification;
+        }
 
-        string configPath = Path.Combine(configDir, SettingsFileName);
+        if (SettingsFileFullName is not null)
+        {
+            // Already set by a previous Load() or by the environment
+            // variable path above. Use it as-is.
+        }
+        else if (Environment.GetEnvironmentVariable("POSTIT_SETTINGS_JSON") is string envPath
+            && !string.IsNullOrWhiteSpace(envPath))
+        {
+            FileInfo configByEnvFileInfo = new FileInfo(envPath);
+            if (!configByEnvFileInfo.Exists)
+            {
+                throw new Exception($"🩎 Settings file not found at {configByEnvFileInfo.FullName}");
+            }
+            SettingsFileFullName = configByEnvFileInfo.FullName;
+        }
+        else
+        {
+             string configDir = Path.Combine(
+                Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
+                "PostIt");
+            SettingsFileFullName = Path.Combine(configDir, "postit-settings.json");
+        }
 
-        FileInfo configFileInfo = new FileInfo(configPath);
+        FileInfo configFileInfo = new FileInfo(SettingsFileFullName);
 
         if (!configFileInfo.Exists)
         {
@@ -285,6 +319,7 @@ public partial class Settings : ViewModelBase
             using var reader = new StreamReader(stream);
             var json = reader.ReadToEnd();
             ApplyJson(json, $"user file {configFileInfo.FullName}");
+            SettingsFileFullName = configFileInfo.FullName;
             Loaded = true;
         }
         catch (Exception ex)
@@ -336,7 +371,7 @@ public partial class Settings : ViewModelBase
             // → our overridden dispatcher-safe marshaller below.
             else lock (_mutationGate)
             {
-                var legacyApiUrl = TryReadLegacyApiUrl(json);
+                var legacyApiUrl = TryReadApiUrl(json);
                 this.Authentication = settings.Authentication;
                 this.DarkMode = settings.DarkMode;
                 this.BlogsApiUrl = !string.IsNullOrWhiteSpace(settings.BlogsApiUrl)
@@ -346,6 +381,7 @@ public partial class Settings : ViewModelBase
                     ? settings.ApiUrl
                     : this.ApiUrl;
                 this.SearchText = settings.SearchText ?? string.Empty;
+                this.ProviderOngoingRequestsSortOption = settings.ProviderOngoingRequestsSortOption ?? string.Empty;
                 if (!(settings.Authentication is null))
                 {
                     this.Authentication = new AuthenticationSettings();
@@ -391,7 +427,7 @@ public partial class Settings : ViewModelBase
         }
     }
 
-    private static string? TryReadLegacyApiUrl(string json)
+    private static string? TryReadApiUrl(string json)
     {
         try
         {
@@ -424,6 +460,7 @@ public partial class Settings : ViewModelBase
         this.BlogsApiUrl = "https://blogs.pschneider.fr/api/v1/";
         this.ApiUrl = "https://api.pschneider.fr/api/v1/";
         this.SearchText = string.Empty;
+        this.ProviderOngoingRequestsSortOption = string.Empty;
     }
 
     /// <summary>
@@ -446,11 +483,17 @@ public partial class Settings : ViewModelBase
     {
         SetActionStatus("Enregistrement des parametres...", StatusSeverity.Info);
 
-        var configDir = Path.Combine(
-            Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
-            "PostIt");
-        Directory.CreateDirectory(configDir);
-        var configPath = Path.Combine(configDir, SettingsFileName);
+        if (SettingsFileFullName is null)
+        {
+            var configDir = Path.Combine(
+                Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
+                "PostIt");
+            Directory.CreateDirectory(configDir);
+            SettingsFileFullName = Path.Combine(configDir, DEFAULT_SETTINGS_FILENAME);
+        }
+
+        var configPath = SettingsFileFullName!;
+        Directory.CreateDirectory(Path.GetDirectoryName(configPath)!);
 
         lock (_mutationGate)
         {
@@ -466,7 +509,7 @@ public partial class Settings : ViewModelBase
                         UnixFileMode.UserRead | UnixFileMode.UserWrite);
                 IsDirty = false;
                 SetActionStatus("Parametres sauvegardes.", StatusSeverity.Info);
-                
+
                 Console.WriteLine($"💾 Settings saved to {configPath}");
             }
             catch (Exception ex)
@@ -489,6 +532,7 @@ public partial class Settings : ViewModelBase
     /// </summary>
     partial void OnIsDirtyChanged(bool value) => SaveCommand.NotifyCanExecuteChanged();
 
+
     public override bool CanNavigateNext { get => false; protected set => throw new System.NotImplementedException(); }
     public override bool CanNavigatePrevious { get => true; protected set => throw new System.NotImplementedException(); }
 }

src/PostIt/PostIt/ViewModels/Signature/SignaturePageViewModel.cs

@@ -85,10 +85,12 @@ public partial class SignaturePageViewModel : ViewModelBase, IActionStatusViewMo
     }
 
     /// <summary>
-    /// Bind a freshly-constructed (or re-templated) control to this
-    /// VM. Called from the view's code-behind once the control has
-    /// been added to the visual tree and its template applied (so
-    /// <see cref="SignaturePadControl.CaptureArea"/> is wired).
+    /// Bind the inner <see cref="SignaturePadControl"/> of the page's
+    /// <see cref="SignaturePadView"/> to this VM. Called from the
+    /// page's code-behind once the view is in the visual tree (so the
+    /// control's <see cref="SignaturePadControl.CaptureArea"/> is
+    /// wired). Attaching to the control directly (rather than the
+    /// view) keeps the same contract the headless tests use.
     /// </summary>
     public void Attach(SignaturePadControl control)
     {

src/PostIt/PostIt/Views/Activity/BillingQueryDetailsPage.axaml

@@ -14,7 +14,7 @@
             <TextBlock Text="{Binding ContextLabel}" Opacity="0.75" />
         </StackPanel>
 
-        <Grid Grid.Row="1" Margin="0,10,0,0" ColumnDefinitions="Auto,8,Auto,*">
+        <Grid Grid.Row="1" Margin="0,10,0,0" ColumnDefinitions="Auto,8,Auto,8,Auto,8,Auto,*">
             <Button Grid.Column="0"
                     Content="Retour"
                     Command="{Binding BackCommand}" />
@@ -22,6 +22,12 @@
                     Content="Ouvrir en edition"
                     Command="{Binding OpenEditorCommand}"
                     IsVisible="{Binding CanEdit}" />
+            <Button Grid.Column="4"
+                    Content="Télécharger PDF"
+                    Command="{Binding DownloadPdfCommand}" />
+            <Button Grid.Column="6"
+                    Content="Télécharger TeX"
+                    Command="{Binding DownloadTexCommand}" />
         </Grid>
 
         <ScrollViewer Grid.Row="2" Margin="0,12,0,12">

src/PostIt/PostIt/Views/Activity/CommandFormsPage.axaml

@@ -34,13 +34,13 @@
 
         <Grid Grid.Row="3" Margin="0,12,0,0" ColumnDefinitions="Auto,8,Auto,8,Auto,12,*">
             <Button Grid.Column="0"
-                    Content="Ouvrir le formulaire"
+                    Content="Ouvrir le formulaire de demande"
                     Command="{Binding OpenSelectedFormCommand}" />
             <Button Grid.Column="2"
-                Content="Voir les commandes"
+                Content="Voir les demandes non validées"
                 Command="{Binding OpenQueriesCommand}" />
             <Button Grid.Column="4"
-                    Content="Demandes en cours (lecture seule)"
+                    Content="Demandes en cours (validées, en lecture seule)"
                     Command="{Binding OpenOngoingQueriesCommand}" />
             <postitControls:StatusBar Grid.Column="6"
                                       DataContext="{Binding ActionStatus}" />

src/PostIt/PostIt/Views/Activity/EstimateEditionPage.axaml

@@ -0,0 +1,151 @@
+<ContentPage xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:PostIt.ViewModels"
+             xmlns:postitControls="using:PostIt.Controls"
+             x:Class="PostIt.Views.EstimateEditionPage"
+             x:DataType="vm:EstimateEditionPageViewModel"
+             Header="Edition de devis">
+    <Grid RowDefinitions="Auto,Auto,*,Auto" Margin="12">
+        <StackPanel Grid.Row="0" Spacing="3">
+            <TextBlock Text="{Binding Title}"
+                       FontSize="20"
+                       FontWeight="Bold" />
+            <TextBlock Text="{Binding ContextLabel}" Opacity="0.75" />
+        </StackPanel>
+
+        <Grid Grid.Row="1" ColumnDefinitions="Auto,8,*" Margin="0,10,0,8">
+            <Button Grid.Column="0"
+                    Content="Retour"
+                    Command="{Binding BackCommand}" />
+        </Grid>
+
+        <ScrollViewer Grid.Row="2">
+            <StackPanel Spacing="10">
+                <Border BorderThickness="1"
+                        BorderBrush="#22000000"
+                        CornerRadius="8"
+                        Padding="10">
+                    <Grid ColumnDefinitions="Auto,12,*" RowDefinitions="Auto,Auto,Auto" RowSpacing="8">
+                        <TextBlock Grid.Row="0"
+                                   Grid.Column="0"
+                                   Text="Demande"
+                                   FontWeight="SemiBold"
+                                   VerticalAlignment="Center" />
+                        <TextBlock Grid.Row="0"
+                                   Grid.Column="2"
+                                   Text="{Binding QueryDescription}"
+                                   TextWrapping="Wrap"
+                                   Opacity="0.75" />
+
+                        <TextBlock Grid.Row="1"
+                                   Grid.Column="0"
+                                   Text="Titre"
+                                   FontWeight="SemiBold"
+                                   VerticalAlignment="Center" />
+                        <TextBox Grid.Row="1"
+                                 Grid.Column="2"
+                                 Text="{Binding EstimateTitle}"
+                                 PlaceholderText="Titre du devis" />
+
+                        <TextBlock Grid.Row="2"
+                                   Grid.Column="0"
+                                   Text="Description"
+                                   FontWeight="SemiBold"
+                                   VerticalAlignment="Top" />
+                        <TextBox Grid.Row="2"
+                                 Grid.Column="2"
+                                 Text="{Binding EstimateDescription}"
+                                 PlaceholderText="Description détaillée du devis"
+                                 AcceptsReturn="True"
+                                 TextWrapping="Wrap"
+                                 MinHeight="70" />
+                    </Grid>
+                </Border>
+
+                <Border BorderThickness="1"
+                        BorderBrush="#22000000"
+                        CornerRadius="8"
+                        Padding="10">
+                    <StackPanel Spacing="8">
+                        <Grid ColumnDefinitions="*,Auto,8,Auto">
+                            <TextBlock Grid.Column="0"
+                                       Text="Lignes du devis"
+                                       FontWeight="SemiBold"
+                                       VerticalAlignment="Center" />
+                            <Button Grid.Column="1"
+                                    Content="Ajouter une ligne"
+                                    Command="{Binding AddLineCommand}" />
+                            <Button Grid.Column="3"
+                                    Content="Retirer la ligne"
+                                    Command="{Binding RemoveLineCommand}" />
+                        </Grid>
+
+                        <ListBox ItemsSource="{Binding Lines}"
+                                 SelectedItem="{Binding SelectedLine, Mode=TwoWay}">
+                            <ListBox.ItemTemplate>
+                                <DataTemplate x:DataType="vm:EstimateLineItemViewModel">
+                                    <Border BorderThickness="1"
+                                            BorderBrush="#22000000"
+                                            CornerRadius="6"
+                                            Padding="8"
+                                            Margin="0,0,0,8">
+                                        <Grid ColumnDefinitions="*,8,110,8,130,8,90"
+                                              RowDefinitions="Auto,Auto"
+                                              RowSpacing="6">
+                                            <TextBox Grid.Row="0"
+                                                     Grid.Column="0"
+                                                     Text="{Binding Name}"
+                                                     PlaceholderText="Nom de la ligne" />
+                                            <NumericUpDown Grid.Row="0"
+                                                           Grid.Column="2"
+                                                           Value="{Binding Count}"
+                                                           Minimum="1"
+                                                           Increment="1"
+                                                           FormatString="0" />
+                                            <NumericUpDown Grid.Row="0"
+                                                           Grid.Column="4"
+                                                           Value="{Binding UnitaryCost}"
+                                                           Increment="0.5"
+                                                           FormatString="0.00" />
+                                            <TextBlock Grid.Row="0"
+                                                       Grid.Column="6"
+                                                       Text="{Binding LineTotalLabel}"
+                                                       VerticalAlignment="Center"
+                                                       HorizontalAlignment="Right"
+                                                       FontWeight="SemiBold" />
+                                            <TextBox Grid.Row="1"
+                                                     Grid.Column="0"
+                                                     Grid.ColumnSpan="7"
+                                                     Text="{Binding Description}"
+                                                     PlaceholderText="Description de la ligne" />
+                                        </Grid>
+                                    </Border>
+                                </DataTemplate>
+                            </ListBox.ItemTemplate>
+                        </ListBox>
+
+                        <Grid ColumnDefinitions="*,Auto">
+                            <TextBlock Grid.Column="1"
+                                       Text="{Binding TotalLabel, StringFormat='Total : {0}'}"
+                                       FontSize="16"
+                                       FontWeight="Bold"
+                                       HorizontalAlignment="Right" />
+                        </Grid>
+                    </StackPanel>
+                </Border>
+            </StackPanel>
+        </ScrollViewer>
+
+        <Grid Grid.Row="3" ColumnDefinitions="Auto,8,*,Auto" Margin="0,12,0,0">
+            <Button Grid.Column="0"
+                    Content="{Binding SendLabel}"
+                    Command="{Binding SendCommand}" />
+            <postitControls:StatusBar Grid.Column="2"
+                                      DataContext="{Binding ActionStatus}" />
+            <ProgressBar Grid.Column="3"
+                         Width="120"
+                         IsIndeterminate="True"
+                         IsVisible="{Binding IsBusy}" />
+        </Grid>
+    </Grid>
+</ContentPage>

src/PostIt/PostIt/Views/Activity/EstimateEditionPage.axaml.cs

@@ -0,0 +1,17 @@
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace PostIt.Views;
+
+public partial class EstimateEditionPage : ContentPage
+{
+    public EstimateEditionPage()
+    {
+        InitializeComponent();
+    }
+
+    private void InitializeComponent()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+}

src/PostIt/PostIt/Views/Activity/EstimateListPage.axaml

@@ -0,0 +1,77 @@
+<ContentPage xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:PostIt.ViewModels"
+             xmlns:dto="using:Yavsc.Api.Client"
+             xmlns:postitControls="using:PostIt.Controls"
+             x:Class="PostIt.Views.EstimateListPage"
+             x:DataType="vm:EstimateListPageViewModel"
+             Header="{Binding Title}">
+    <Grid RowDefinitions="Auto,Auto,*,Auto" Margin="12">
+        <StackPanel Grid.Row="0" Spacing="3">
+            <TextBlock Text="{Binding Title}" FontSize="20" FontWeight="Bold" />
+            <TextBlock Text="{Binding Subtitle}" Opacity="0.75" />
+        </StackPanel>
+
+        <Grid Grid.Row="1" ColumnDefinitions="Auto,8,*" Margin="0,10,0,8">
+            <Button Grid.Column="0" Content="Rafraîchir" Command="{Binding RefreshCommand}" />
+            <TextBox Grid.Column="2"
+                     PlaceholderText="Filtrer: titre, description, type, partie..."
+                     Text="{Binding FilterText, Mode=TwoWay}" />
+        </Grid>
+
+        <ListBox Grid.Row="2"
+                 ItemsSource="{Binding Estimates}"
+                 SelectedItem="{Binding SelectedEstimate, Mode=TwoWay}">
+            <ListBox.ItemTemplate>
+                <DataTemplate x:DataType="dto:EstimateDto">
+                    <Border BorderThickness="1"
+                            BorderBrush="#22000000"
+                            CornerRadius="8"
+                            Padding="10"
+                            Margin="0,0,0,8">
+                        <StackPanel Spacing="8">
+                            <Grid RowDefinitions="Auto,Auto" ColumnDefinitions="*,Auto">
+                                <TextBlock Grid.Row="0"
+                                           Grid.Column="0"
+                                           Text="{Binding Title}"
+                                           FontWeight="Bold"
+                                           TextWrapping="Wrap" />
+                                <TextBlock Grid.Row="0"
+                                           Grid.Column="1"
+                                           Text="{Binding Id}"
+                                           FontSize="11"
+                                           Opacity="0.75"
+                                           HorizontalAlignment="Right" />
+
+                                <TextBlock Grid.Row="1"
+                                           Grid.Column="0"
+                                           Margin="0,6,0,0"
+                                           Text="{Binding Description}"
+                                           FontSize="11"
+                                           Opacity="0.75"
+                                           TextWrapping="Wrap" />
+                                <TextBlock Grid.Row="1"
+                                           Grid.Column="1"
+                                           Margin="0,6,0,0"
+                                           Text="{Binding Bill.Count}"
+                                           FontSize="11"
+                                           Opacity="0.65"
+                                           HorizontalAlignment="Right" />
+                            </Grid>
+                            <Button Content="Ouvrir"
+                                    HorizontalAlignment="Right"
+                                    Command="{Binding $parent[ContentPage].((vm:EstimateListPageViewModel)DataContext).OpenEstimateCommand}"
+                                    CommandParameter="{Binding}" />
+                        </StackPanel>
+                    </Border>
+                </DataTemplate>
+            </ListBox.ItemTemplate>
+        </ListBox>
+
+        <Grid Grid.Row="3" ColumnDefinitions="*,Auto" Margin="0,12,0,0">
+            <postitControls:StatusBar Grid.Column="0"
+                                      DataContext="{Binding ActionStatus}" />
+            <ProgressBar Grid.Column="1" Width="120" IsIndeterminate="True" IsVisible="{Binding IsBusy}" />
+        </Grid>
+    </Grid>
+</ContentPage>

src/PostIt/PostIt/Views/Activity/EstimateListPage.axaml.cs

@@ -0,0 +1,33 @@
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using PostIt.ViewModels;
+
+namespace PostIt.Views;
+
+public partial class EstimateListPage : ContentPage
+{
+    public EstimateListPage()
+    {
+        InitializeComponent();
+    }
+
+    private void InitializeComponent()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    // Re-fetch the list when returning to it (e.g. after validating an
+    // estimate on the validation page). Avalonia's Page.OnNavigatedTo
+    // fires on the page popped back to with NavigationType.Pop; the list
+    // VM is retained on the nav stack while away, so this refresh picks
+    // up the server-side filter change that removed the signed estimate.
+    protected override void OnNavigatedTo(NavigatedToEventArgs e)
+    {
+        base.OnNavigatedTo(e);
+        if (e.NavigationType == NavigationType.Pop
+            && DataContext is EstimateListPageViewModel vm)
+        {
+            _ = vm.RefreshAsync();
+        }
+    }
+}

src/PostIt/PostIt/Views/Activity/EstimateValidationPage.axaml

@@ -0,0 +1,146 @@
+<ContentPage xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:PostIt.ViewModels"
+             xmlns:controls="using:PostIt.Controls"
+             xmlns:dto="using:Yavsc.Api.Client"
+             xmlns:postitControls="using:PostIt.Controls"
+             x:Class="PostIt.Views.EstimateValidationPage"
+             x:DataType="vm:EstimateValidationPageViewModel"
+             Header="Validation du devis">
+    <Grid RowDefinitions="Auto,*,Auto" Margin="12">
+        <StackPanel Grid.Row="0" Spacing="3" Margin="0,0,0,8">
+            <TextBlock Text="{Binding Title}"
+                       FontSize="20"
+                       FontWeight="Bold"
+                       TextWrapping="Wrap" />
+            <TextBlock Text="{Binding RoleLabel}" Opacity="0.75" />
+            <TextBlock Text="{Binding ValidationStateText}"
+                       FontSize="11"
+                       Opacity="0.75"
+                       TextWrapping="Wrap" />
+        </StackPanel>
+
+        <ScrollViewer Grid.Row="1">
+            <StackPanel Spacing="10">
+                <Border BorderThickness="1"
+                        BorderBrush="#22000000"
+                        CornerRadius="8"
+                        Padding="10">
+                    <StackPanel Spacing="6">
+                        <Grid ColumnDefinitions="Auto,12,*">
+                            <TextBlock Grid.Column="0"
+                                       Text="N°"
+                                       FontWeight="SemiBold" />
+                            <TextBlock Grid.Column="2"
+                                       Text="{Binding EstimateId}" />
+                        </Grid>
+                        <Grid ColumnDefinitions="Auto,12,*">
+                            <TextBlock Grid.Column="0"
+                                       Text="Type"
+                                       FontWeight="SemiBold" />
+                            <TextBlock Grid.Column="2"
+                                       Text="{Binding CommandType}" />
+                        </Grid>
+                        <TextBlock Text="{Binding Description}"
+                                   TextWrapping="Wrap"
+                                   Opacity="0.85" />
+                    </StackPanel>
+                </Border>
+
+                <Border BorderThickness="1"
+                        BorderBrush="#22000000"
+                        CornerRadius="8"
+                        Padding="10">
+                    <StackPanel Spacing="8">
+                        <TextBlock Text="Lignes du devis" FontWeight="SemiBold" />
+                        <ItemsControl ItemsSource="{Binding Bill}">
+                            <ItemsControl.ItemTemplate>
+                                <DataTemplate x:DataType="dto:EstimateLineDto">
+                                    <Grid ColumnDefinitions="*,8,60,8,120" Margin="0,0,0,4">
+                                        <TextBlock Grid.Column="0"
+                                                   Text="{Binding Name}"
+                                                   TextWrapping="Wrap" />
+                                        <TextBlock Grid.Column="2"
+                                                   Text="{Binding Count}"
+                                                   HorizontalAlignment="Right" />
+                                        <StackPanel Grid.Column="4"
+                                                    Orientation="Horizontal"
+                                                    HorizontalAlignment="Right"
+                                                    Spacing="4">
+                                            <TextBlock Text="{Binding UnitaryCost, StringFormat='{}{0:N2}'}" />
+                                            <TextBlock Text="{Binding Currency}" Opacity="0.7" />
+                                        </StackPanel>
+                                    </Grid>
+                                </DataTemplate>
+                            </ItemsControl.ItemTemplate>
+                        </ItemsControl>
+                    </StackPanel>
+                </Border>
+
+                <Border BorderThickness="1"
+                        BorderBrush="#22000000"
+                        CornerRadius="8"
+                        Padding="10">
+                    <StackPanel Spacing="8">
+                        <TextBlock Text="Signature du prestataire" FontWeight="SemiBold" />
+                        <TextBlock Text="{Binding ProSignatureHint}"
+                                   FontSize="11"
+                                   Opacity="0.7" />
+                        <controls:SignaturePadView x:Name="ProPad"
+                                                   CaptureWidth="560"
+                                                   CaptureHeight="160" />
+                    </StackPanel>
+                </Border>
+
+                <Border BorderThickness="1"
+                        BorderBrush="#22000000"
+                        CornerRadius="8"
+                        Padding="10">
+                    <StackPanel Spacing="8">
+                        <TextBlock Text="Signature du client" FontWeight="SemiBold" />
+                        <TextBlock Text="{Binding ClientSignatureHint}"
+                                   FontSize="11"
+                                   Opacity="0.7" />
+                        <controls:SignaturePadView x:Name="ClientPad"
+                                                   CaptureWidth="560"
+                                                   CaptureHeight="160" />
+                    </StackPanel>
+                </Border>
+
+                <TextBlock FontSize="11"
+                           Foreground="DarkSlateGray">
+                    <Run Text="Votre signature : traits " />
+                    <Run Text="{Binding StrokeCount, Mode=OneWay}" />
+                    <Run Text=" · points " />
+                    <Run Text="{Binding PointCount, Mode=OneWay}" />
+                </TextBlock>
+            </StackPanel>
+        </ScrollViewer>
+
+        <Grid Grid.Row="2" ColumnDefinitions="Auto,*,Auto" Margin="0,12,0,0">
+            <StackPanel Grid.Column="0" Orientation="Horizontal" Spacing="8">
+                <Button Content="Effacer"
+                        Command="{Binding ClearSignatureCommand}" />
+                <Button Content="Valider"
+                        Command="{Binding ValidateCommand}" />
+                <Button Content="Refuser"
+                        Command="{Binding RejectCommand}" />
+                <Button Content="Télécharger PDF"
+                        Command="{Binding DownloadPdfCommand}" />
+                <Button Content="Télécharger TeX"
+                        Command="{Binding DownloadTexCommand}" />
+                <Button Content="Retour"
+                        Command="{Binding BackCommand}" />
+            </StackPanel>
+            <StackPanel Grid.Column="2"
+                        Orientation="Horizontal"
+                        Spacing="8"
+                        VerticalAlignment="Center">
+                <ProgressBar Width="120"
+                             IsIndeterminate="True"
+                             IsVisible="{Binding IsBusy}" />
+                <postitControls:StatusBar DataContext="{Binding ActionStatus}" />
+            </StackPanel>
+        </Grid>
+    </Grid>
+</ContentPage>

src/PostIt/PostIt/Views/Activity/EstimateValidationPage.axaml.cs

@@ -0,0 +1,32 @@
+using Avalonia.Controls;
+using PostIt.Controls;
+using PostIt.ViewModels;
+
+namespace PostIt.Views;
+
+public partial class EstimateValidationPage : ContentPage
+{
+    private EstimateValidationPageViewModel? _vm;
+
+    public EstimateValidationPage()
+    {
+        InitializeComponent();
+
+        DataContextChanged += (_, _) => RebindViewModel(DataContext as EstimateValidationPageViewModel);
+        Unloaded += (_, _) => _vm?.Detach();
+    }
+
+    private void RebindViewModel(EstimateValidationPageViewModel? vm)
+    {
+        if (_vm is not null)
+        {
+            _vm.Detach();
+        }
+
+        _vm = vm;
+
+        if (_vm is null || ProPad is null || ClientPad is null) return;
+
+        _vm.Attach(ProPad.SignaturePad, ClientPad.SignaturePad);
+    }
+}

src/PostIt/PostIt/Views/Activity/ProviderOngoingRequestsPage.axaml

@@ -0,0 +1,102 @@
+<ContentPage xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:PostIt.ViewModels"
+             xmlns:dto="using:Yavsc.Api.Client"
+             xmlns:postitControls="using:PostIt.Controls"
+             x:Class="PostIt.Views.ProviderOngoingRequestsPage"
+             x:DataType="vm:ProviderOngoingRequestsPageViewModel"
+             Header="Mes demandes en cours">
+    <Grid RowDefinitions="Auto,Auto,Auto,*,Auto" Margin="12">
+        <StackPanel Grid.Row="0" Spacing="3">
+            <TextBlock Text="{Binding Title}" FontSize="20" FontWeight="Bold" />
+            <TextBlock Text="Point de vue fournisseur" Opacity="0.75" />
+        </StackPanel>
+
+        <Grid Grid.Row="1" ColumnDefinitions="Auto,8,Auto,8,*,8,Auto" Margin="0,10,0,8">
+            <Button Grid.Column="0" Content="Rafraîchir" Command="{Binding RefreshCommand}" />
+            <ComboBox Grid.Column="2"
+                      Width="220"
+                      ItemsSource="{Binding SortOptions}"
+                      SelectedItem="{Binding SelectedSortOption, Mode=TwoWay}" />
+            <TextBox Grid.Column="4"
+                     PlaceholderText="Filtrer: activité, code, client, statut..."
+                     Text="{Binding FilterText, Mode=TwoWay}" />
+            <TextBlock Grid.Column="6"
+                       HorizontalAlignment="Right"
+                       VerticalAlignment="Center"
+                       Text="{Binding Queries.Count, StringFormat='Résultats : {0}'}"
+                       Opacity="0.7" />
+        </Grid>
+
+        <TextBlock Grid.Row="2"
+                   Text="Astuce: sélectionnez une ligne puis ouvrez le détail ou l'édition directe."
+                   Opacity="0.65"
+                   FontSize="11"
+                   Margin="0,0,0,8" />
+
+        <Grid Grid.Row="3" RowDefinitions="*,Auto">
+            <ListBox Grid.Row="0"
+                     ItemsSource="{Binding Queries}"
+                     SelectedItem="{Binding SelectedQuery, Mode=TwoWay}">
+                <ListBox.ItemTemplate>
+                    <DataTemplate x:DataType="dto:BillingQuerySummaryDto">
+                        <Border BorderThickness="1"
+                                BorderBrush="#22000000"
+                                CornerRadius="8"
+                                Padding="10"
+                                Margin="0,0,0,8">
+                            <Grid RowDefinitions="Auto,Auto" ColumnDefinitions="*,Auto">
+                                <TextBlock Grid.Row="0"
+                                           Grid.Column="0"
+                                           Text="{Binding Description}"
+                                           FontWeight="Bold"
+                                           TextWrapping="Wrap" />
+                                <TextBlock Grid.Row="0"
+                                           Grid.Column="1"
+                                           Text="{Binding Status}"
+                                           FontSize="11"
+                                           Opacity="0.75"
+                                           HorizontalAlignment="Right" />
+
+                                <TextBlock Grid.Row="1"
+                                           Grid.Column="0"
+                                           Margin="0,6,0,0"
+                                           Text="{Binding ActivityCode, StringFormat='Activité : {0}'}"
+                                           FontSize="11"
+                                           Opacity="0.75" />
+                                <TextBlock Grid.Row="1"
+                                           Grid.Column="1"
+                                           Margin="0,6,0,0"
+                                           Text="{Binding BillingCode, StringFormat='Code : {0}'}"
+                                           FontSize="11"
+                                           Opacity="0.65"
+                                           HorizontalAlignment="Right" />
+                            </Grid>
+                        </Border>
+                    </DataTemplate>
+                </ListBox.ItemTemplate>
+            </ListBox>
+
+                <StackPanel Grid.Row="1"
+                    Orientation="Horizontal"
+                    HorizontalAlignment="Right"
+                    Margin="0,8,0,0"
+                    Spacing="8">
+                <Button Content="Ouvrir le détail"
+                    Command="{Binding OpenSelectedQueryCommand}" />
+                <Button Content="Ouvrir en édition"
+                    Command="{Binding OpenSelectedEditorCommand}"
+                    />
+                <Button Content="Créer un devis"
+                    Command="{Binding CreateEstimateForSelectedCommand}"
+                    />
+                </StackPanel>
+        </Grid>
+
+            <Grid Grid.Row="4" ColumnDefinitions="*,Auto" Margin="0,12,0,0">
+            <postitControls:StatusBar Grid.Column="0"
+                                      DataContext="{Binding ActionStatus}" />
+            <ProgressBar Grid.Column="1" Width="120" IsIndeterminate="True" IsVisible="{Binding IsBusy}" />
+        </Grid>
+    </Grid>
+</ContentPage>

src/PostIt/PostIt/Views/Activity/ProviderOngoingRequestsPage.axaml.cs

@@ -0,0 +1,17 @@
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace PostIt.Views;
+
+public partial class ProviderOngoingRequestsPage : ContentPage
+{
+    public ProviderOngoingRequestsPage()
+    {
+        InitializeComponent();
+    }
+
+    private void InitializeComponent()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+}

src/PostIt/PostIt/Views/Blogs/BlogsPage.axaml

@@ -0,0 +1,165 @@
+<ContentPage xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:vm="using:PostIt.ViewModels"
+             xmlns:postitControls="using:PostIt.Controls"
+             xmlns:AvaloniaEdit="clr-namespace:AvaloniaEdit;assembly=AvaloniaEdit"
+             xmlns:models="using:Yavsc.Blogspot"
+             xmlns:views="using:PostIt.Views.Blogs"
+             xmlns:md="using:MarkdownViewer.Core.Controls"
+             mc:Ignorable="d"
+             x:Class="PostIt.Views.Blogs.BlogsPage"
+             x:DataType="vm:BlogsViewModel"
+             HorizontalAlignment="Stretch"
+             VerticalAlignment="Stretch">
+  <Design.DataContext>
+    <vm:BlogsViewModel />
+  </Design.DataContext>
+  <ScrollViewer
+  VerticalScrollBarVisibility="Visible"
+  HorizontalScrollBarVisibility="Disabled"
+  Padding="5"
+  Margin="5"
+      >
+
+
+  <StackPanel HorizontalAlignment="Stretch">
+    <StackPanel Orientation="Horizontal" Spacing="10" Margin="5">
+      <TextBlock Text="Blog Posts" FontSize="20" FontWeight="SemiBold" />
+      <TextBox HorizontalAlignment="Right"
+               Text="{Binding SearchText, Mode=TwoWay}" PlaceholderText="Filter by title or author..." />
+    </StackPanel>
+    <CommandBar IsDynamicOverflowEnabled="True"
+           HorizontalAlignment="Right"     >
+      <CommandBar.PrimaryCommands>
+        <CommandBarButton Label="Refresh" Command="{Binding RefreshAsync}">
+          <CommandBarButton.Icon>
+            <PathIcon Data="{StaticResource RefreshIcon}" />
+          </CommandBarButton.Icon>
+        </CommandBarButton>
+        <CommandBarButton x:Name="SaveButton" Label="Save" Command="{Binding SaveAsync}">
+          <CommandBarButton.Icon>
+            <PathIcon Data="{StaticResource SaveIcon}" />
+          </CommandBarButton.Icon>
+        </CommandBarButton>
+        <CommandBarButton Label="Delete" Command="{Binding DeleteAsync}">
+          <CommandBarButton.Icon>
+            <PathIcon Data="{StaticResource DeleteIcon}" />
+          </CommandBarButton.Icon>
+        </CommandBarButton>
+        <CommandBarButton Label="Ajouter fichiers" Click="AddAttachment_Click"
+                          x:Name="AddAttachmentButton">
+          <CommandBarButton.Icon>
+            <PathIcon Data="{StaticResource AddIcon}" />
+          </CommandBarButton.Icon>
+        </CommandBarButton>
+        <CommandBarButton x:Name="ManageAclButton"
+                          Label="ACL"
+                          Command="{Binding ManageAclAsync}">
+          <CommandBarButton.Icon>
+            <PathIcon Data="{StaticResource AclIcon}" />
+          </CommandBarButton.Icon>
+        </CommandBarButton>
+        <CommandBarButton x:Name="OpenCirclesButton"
+                          Label="Mes cercles" Command="{Binding OpenCirclesAsync}">
+          <CommandBarButton.Icon>
+            <PathIcon Data="{StaticResource CircleIcon}" />
+          </CommandBarButton.Icon>
+        </CommandBarButton>
+        <CommandBarToggleButton Label="Publié"
+               Command="{Binding TogglePublishCommand}"
+                                IsChecked="{Binding DraftIsPublished, Mode=TwoWay}">
+          <CommandBarToggleButton.Icon>
+            <PathIcon Data="{StaticResource PublishedIcon}" />
+          </CommandBarToggleButton.Icon>
+        </CommandBarToggleButton>
+        <CommandBarToggleButton Label="Markdown Viewer"
+                                IsChecked="{Binding IsMarkdownViewerVisible, Mode=TwoWay}">
+          <CommandBarToggleButton.Icon>
+            <PathIcon Data="{StaticResource MarkdownIcon}" />
+          </CommandBarToggleButton.Icon>
+        </CommandBarToggleButton>
+        <CommandBarButton x:Name="OpenSignatureDevButton"
+                          Label="[DEV] Signature" Command="{Binding OpenSignatureDevAsync}">
+          <CommandBarButton.Icon>
+            <PathIcon Data="{StaticResource SignIcon}" />
+          </CommandBarButton.Icon>
+        </CommandBarButton>
+      </CommandBar.PrimaryCommands>
+    </CommandBar>
+
+      <Grid Margin="12" RowSpacing="12">
+        <Grid.RowDefinitions>
+          <RowDefinition Height="Auto" />
+          <RowDefinition Height="*" />
+          <RowDefinition Height="Auto" />
+        </Grid.RowDefinitions>
+        <Border Grid.Row="1" BorderBrush="Gray" BorderThickness="1" Padding="8">
+          <ListBox ItemsSource="{Binding FilteredPosts}"
+                   SelectedItem="{Binding SelectedPost, Mode=TwoWay}">
+            <ListBox.ItemTemplate>
+              <DataTemplate x:DataType="models:BlogPostDto">
+                <StackPanel Spacing="4" >
+                  <TextBlock Text="{Binding Title}" FontWeight="SemiBold" />
+                  <TextBlock Text="{Binding DateModified, StringFormat='Updated: {0:yyyy-MM-dd HH:mm}'}" FontSize="10" Foreground="Gray" />
+                  <TextBlock Text="{Binding AuthorId}" FontSize="10" Foreground="DarkSlateGray" />
+                </StackPanel>
+              </DataTemplate>
+            </ListBox.ItemTemplate>
+          </ListBox>
+        </Border>
+
+        <md:MarkdownViewer Grid.Row="2" Name="MarkdownViewer"
+          IsVisible="{Binding IsMarkdownViewerVisible}"
+          MarkdownText="{Binding DraftArticle}" />
+
+        <Border Grid.Row="2" BorderBrush="Gray" BorderThickness="1" Padding="8"
+              IsVisible="{Binding !IsMarkdownViewerVisible}">
+          <Grid RowSpacing="10"
+                HorizontalAlignment="Stretch"
+                VerticalAlignment="Stretch">
+            <Grid.RowDefinitions>
+              <RowDefinition Height="Auto" />
+              <RowDefinition Height="Auto" />
+              <RowDefinition Height="*" />
+              <RowDefinition Height="Auto" />
+            </Grid.RowDefinitions>
+            <Grid.ColumnDefinitions>
+              <ColumnDefinition Width="*" />
+            </Grid.ColumnDefinitions>
+
+            <TextBlock Grid.Row="0" Text="Post detail" FontWeight="SemiBold" />
+            <TextBox x:Name="DraftTitleTextBox"
+                     Grid.Row="1" Text="{Binding DraftTitle, Mode=TwoWay}" PlaceholderText="Title" />
+
+                     <AvaloniaEdit:TextEditor
+                     Grid.Row="2" VerticalAlignment="Stretch"
+
+                      Document="{Binding DraftArticleDocument, Mode=TwoWay}"
+                           ShowLineNumbers="True"
+                           FontFamily="Cascadia Code,Consolas,Menlo,Monospace"/>
+
+
+            <Border Grid.Row="3" BorderBrush="LightGray" BorderThickness="1" Padding="8">
+              <StackPanel Spacing="4">
+                <TextBlock Text="Pièces jointes" FontWeight="SemiBold" />
+                <ItemsControl ItemsSource="{Binding DraftAttachments}">
+                  <ItemsControl.ItemTemplate>
+                    <DataTemplate>
+                      <TextBlock Text="{Binding FileName}" />
+                    </DataTemplate>
+                  </ItemsControl.ItemTemplate>
+                </ItemsControl>
+              </StackPanel>
+            </Border>
+
+            <postitControls:StatusBar Grid.Row="4"
+                                      DataContext="{Binding ActionStatus}" />
+
+          </Grid>
+        </Border>
+      </Grid>
+  </StackPanel>
+    </ScrollViewer>
+</ContentPage>

src/PostIt/PostIt/Views/Blogs/BlogsPage.axaml.cs

@@ -0,0 +1,71 @@
+using System;
+using System.IO;
+using System.Linq;
+using Avalonia.Controls;
+using Avalonia.Platform.Storage;
+using Avalonia.Controls.Primitives;
+
+namespace PostIt.Views.Blogs;
+
+public partial class BlogsPage : ContentPage
+{
+    public BlogsPage()
+    {
+        InitializeComponent();
+    }
+
+    protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
+    {
+        base.OnApplyTemplate(e);
+        if (DataContext is ViewModels.BlogsViewModel vm)
+        {
+            if (!vm.IsLoaded)
+            {
+                vm.RefreshAsync().Wait();
+            }
+        }
+    }
+
+    private async void AddAttachment_Click(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+    {
+        var topLevel = TopLevel.GetTopLevel(this);
+        if (topLevel is null || DataContext is not ViewModels.BlogsViewModel vm)
+            return;
+
+        var files = await topLevel.StorageProvider.OpenFilePickerAsync(new FilePickerOpenOptions
+        {
+            Title = "Choisir des fichiers à joindre au billet",
+            AllowMultiple = true,
+        });
+
+        if (files.Count == 0)
+            return;
+
+        var uploads = new System.Collections.Generic.List<Yavsc.Api.Client.BlogUploadFile>(files.Count);
+        foreach (var file in files)
+        {
+            await using var stream = await file.OpenReadAsync();
+            using var memory = new MemoryStream();
+            await stream.CopyToAsync(memory);
+            uploads.Add(new Yavsc.Api.Client.BlogUploadFile(file.Name, memory.ToArray(), GetMimeType(file.Name)));
+        }
+
+        vm.DraftAttachments.Clear();
+        foreach (var upload in uploads)
+            vm.DraftAttachments.Add(upload);
+    }
+
+    private static string GetMimeType(string fileName)
+    {
+        var ext = Path.GetExtension(fileName)?.ToLowerInvariant();
+        return ext switch
+        {
+            ".png" => "image/png",
+            ".jpg" or ".jpeg" => "image/jpeg",
+            ".webp" => "image/webp",
+            ".gif" => "image/gif",
+            ".pdf" => "application/pdf",
+            _ => "application/octet-stream"
+        };
+    }
+}