Adds the client-side ability to open an estimate from the list, draw a
signature on a reusable SignaturePadView control, and accept or reject it
against /api/v1/front/query/accept|reject. The server resolves the actor
role (provider vs client) from the caller's identity, so the same page works
for either party.
- Yavsc.Api.Client: QueryAcceptanceDto + FrontOfficeApiClient (accept/reject)
- PostIt: extract SignaturePadView UserControl from SignaturePage; new
EstimateValidationPage (VM + view) with Valider/Refuser/Effacer/Retour;
wire OpenEstimate entry point from EstimateListPage; register client/page
in DI + ViewLocator
- Tests: FrontOfficeApiClient + EstimateValidationPageViewModel unit tests;
update EstimateListPageViewModelTests ctor
Co-Authored-By: Claude Code <noreply@anthropic.com>
