feat(i18n): localize ViewModel-built strings via ambient Loc accessor

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ClaudeDo.Ui/ViewModels/Modals/WeeklyReportModalViewModel.cs

@@ -1,3 +1,4 @@
+using ClaudeDo.Ui.Localization;
 using ClaudeDo.Ui.Services;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
@@ -72,16 +73,16 @@ public sealed partial class WeeklyReportModalViewModel : ViewModelBase
     [RelayCommand(CanExecute = nameof(CanGenerate))]
     private async Task Generate()
     {
-        if (!RangeValid) { StatusMessage = "Invalid date range."; return; }
+        if (!RangeValid) { StatusMessage = Loc.T("vm.weeklyReport.invalidRange"); return; }
         IsBusy = true;
-        StatusMessage = "Generating report…";
+        StatusMessage = Loc.T("vm.weeklyReport.generating");
         try
         {
             ReportMarkdown = await _worker.GenerateWeekReportAsync(
                 DateOnly.FromDateTime(StartDate!.Value), DateOnly.FromDateTime(EndDate!.Value));
             StatusMessage = "";
         }
-        catch (Exception ex) { StatusMessage = $"Error: {ex.Message}"; }
+        catch (Exception ex) { StatusMessage = Loc.T("vm.weeklyReport.error", ex.Message); }
         finally { IsBusy = false; }
     }
 }