fix(postit): repair Circles bindings + align UserSearchApi route

- CirclesPage: drop VisualRoot/MainWindow hack, switch to App.PushPageAsync(vm)
- CirclesPageViewModel: make OpenAddMemberAsync public so Avalonia XAML trampoline can call it
- AddCircleMemberDialog: bind SearchAsync/Add (drop Command suffix)
- UserSearchApiController: route under Constants.APIPrefix (= api/v1/user-search), matching the rest of Yavsc.Blogs controllers and the PostIt client's BlogsApiUrl default

src/PostIt/PostIt/App.axaml.cs

@@ -183,7 +183,6 @@ public partial class App : Application
         // here — the parametrised ctors stay for direct test wiring.
         services.AddTransient<PostAclDialog>();
         services.AddTransient<AddCircleMemberDialog>();
-
         // ViewModels
         services.AddSingleton(settings);
         services.AddSingleton<YavscApiClient>(api);

src/PostIt/PostIt/ViewModels/CirclesPageViewModel.cs

@@ -1,9 +1,10 @@
 using System;
 using System.Collections.ObjectModel;
-using System.Linq;
 using System.Threading.Tasks;
+using Avalonia;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
+using Microsoft.Extensions.DependencyInjection;
 using PostIt.Services;
 using Yavsc.Api.Client;
 using Yavsc.Api.Client.Dtos;
@@ -63,12 +64,6 @@ public partial class CirclesPageViewModel : ViewModelBase
     [ObservableProperty]
     public partial string StatusMessage { get; set; } = string.Empty;
 
-    /// <summary>
-    /// Raised when the user wants to add a member to the
-    /// currently selected circle. The view listens to this
-    /// event and opens <c>AddCircleMemberDialog</c>.
-    /// </summary>
-    public event EventHandler? AddMemberRequested;
 
     public CirclesPageViewModel(CircleApiClient client)
     {
@@ -116,6 +111,16 @@ public partial class CirclesPageViewModel : ViewModelBase
         }
     }
 
+    [RelayCommand]
+    internal async Task OpenAddMemberAsync()
+    {
+        var app = Application.Current as App;
+        var services = app?.ServiceProvider;
+        var directory = services.GetRequiredService<IUserDirectory>();
+        AddCircleMemberDialogViewModel model =
+        new AddCircleMemberDialogViewModel(directory);
+        await app.PushPageAsync(model);
+    }
     /// <summary>
     /// Load the members of one of the caller's circles. The
     /// server scopes the endpoint with a 404 when the circle
@@ -231,22 +236,6 @@ public partial class CirclesPageViewModel : ViewModelBase
         }
     }
 
-    /// <summary>
-    /// Fire the <see cref="AddMemberRequested"/> event so
-    /// the view opens <c>AddCircleMemberDialog</c>. The view
-    /// forwards the dialog's <c>Confirmed</c> event back to
-    /// <see cref="OnAddMemberConfirmedAsync"/>.
-    /// </summary>
-    [RelayCommand]
-    public void OpenAddMember()
-    {
-        if (SelectedCircle is null)
-        {
-            StatusMessage = "Sélectionnez d'abord un cercle";
-            return;
-        }
-        AddMemberRequested?.Invoke(this, EventArgs.Empty);
-    }
 
     /// <summary>
     /// Called by the view when the dialog confirms a

src/PostIt/PostIt/Views/AddCircleMemberDialog.axaml

@@ -16,7 +16,7 @@
                      PlaceholderText="Nom ou email d'un utilisateur Yavsc..."
                      HorizontalAlignment="Stretch"/>
             <Button Grid.Column="1" Content="Rechercher"
-                    Command="{Binding SearchCommand}"
+                    Command="{Binding SearchAsync}"
                     Margin="8,0,0,0"/>
         </Grid>
 
@@ -47,7 +47,7 @@
             <TextBlock Grid.Column="0" Text="{Binding StatusMessage}"
                        VerticalAlignment="Center"/>
             <Button Grid.Column="1" Content="Ajouter"
-                    Command="{Binding AddCommand}"
+                    Command="{Binding Add}"
                     IsEnabled="{Binding Selected, Converter={x:Static ObjectConverters.IsNotNull}}"
                     Margin="0,0,8,0"/>
             <Button Grid.Column="2" Content="Fermer"

src/PostIt/PostIt/Views/AddCircleMemberDialog.axaml.cs

@@ -25,12 +25,6 @@ public partial class AddCircleMemberDialog : ContentPage
         InitializeComponent();
     }
 
-    public AddCircleMemberDialog(IUserDirectory directory)
-    {
-        InitializeComponent();
-        DataContext = new AddCircleMemberDialogViewModel(directory);
-    }
-
     private void InitializeComponent()
     {
         AvaloniaXamlLoader.Load(this);

src/PostIt/PostIt/Views/CirclesPage.axaml

@@ -70,7 +70,7 @@
                                FontWeight="Bold"
                                VerticalAlignment="Center"/>
                     <Button Content="Ajouter un membre"
-                            Command="{Binding OpenAddMemberCommand}"/>
+                            Command="{Binding OpenAddMemberAsync}"/>
                 </StackPanel>
                 <ListBox Grid.Row="1"
                          ItemsSource="{Binding Members}">

src/PostIt/PostIt/Views/CirclesPage.axaml.cs

@@ -10,46 +10,10 @@ namespace PostIt.Views;
 
 public partial class CirclesPage : ContentPage
 {
-    private CirclesPageViewModel? _vm;
 
     public CirclesPage()
     {
         InitializeComponent();
-        DataContextChanged += OnDataContextChanged;
-    }
-
-    private void OnDataContextChanged(object? sender, EventArgs e)
-    {
-        // Unsubscribe from the previous VM to avoid leaking
-        // handlers across navigation pushes / DataContext resets.
-        if (_vm is not null)
-            _vm.AddMemberRequested -= OnAddMemberRequested;
-
-        _vm = DataContext as CirclesPageViewModel;
-        if (_vm is not null)
-            _vm.AddMemberRequested += OnAddMemberRequested;
-    }
-
-    private void OnAddMemberRequested(object? sender, EventArgs e)
-    {
-        var app = Application.Current as App;
-        var services = app?.ServiceProvider;
-        if (services is null || _vm is null) return;
-
-        // Resolve the directory via DI. The dialog raises its
-        // own Confirmed event; the VM subscribes via the method
-        // below — we pass the VM in so the closure can call
-        // back into it without the dialog needing to know the
-        // type of its caller. EventHandler<UserSummary> wants a
-        // void return, so wrap the async VM method in a fire-
-        // and-forget helper.
-        var directory = services.GetRequiredService<IUserDirectory>();
-        var dialog = new AddCircleMemberDialog(directory);
-        dialog.ViewModel!.Confirmed += async (sender, picked) =>
-            await _vm.OnAddMemberConfirmedAsync(sender, picked);
-
-        if (this.VisualRoot is MainWindow window)
-            _ = window.NavRoot.PushAsync(dialog);
     }
 
     private void InitializeComponent()

src/Yavsc.Blogs/Controllers/UserSearchApiController.cs

@@ -26,7 +26,7 @@ namespace Yavsc.Blogs.Controllers
     /// exposing it.</para>
     /// </summary>
     [Produces("application/json")]
-    [Route("api/user-search")]
+    [Route( Constants.APIPrefix + "/user-search")]
     [Authorize]
     public class UserSearchApiController : Controller
     {