chore: release v2.4

- Add theme system (Dark/Light palettes, ModernTheme, ThemeManager)
- Add InputDialog, Spinner common view
- Add DuplicatesCsvExportService
- Refresh views, dialogs, and view models across tabs
- Update localization strings (en/fr)
- Tweak services (transfer, permissions, search, user access, ownership elevation, bulk operations)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

SharepointToolbox/ViewModels/FeatureViewModelBase.cs

@@ -23,6 +23,9 @@ public abstract partial class FeatureViewModelBase : ObservableRecipient
     [ObservableProperty]
     private int _progressValue;
 
+    [ObservableProperty]
+    private bool _isIndeterminate;
+
     /// <summary>
     /// Sites selected in the global toolbar picker. Updated via GlobalSitesChangedMessage.
     /// Derived VMs check this in RunOperationAsync before falling back to per-tab SiteUrl.
@@ -46,24 +49,44 @@ public abstract partial class FeatureViewModelBase : ObservableRecipient
         IsRunning = true;
         StatusMessage = string.Empty;
         ProgressValue = 0;
+        IsIndeterminate = false;
         try
         {
             var progress = new Progress<OperationProgress>(p =>
             {
-                ProgressValue = p.Total > 0 ? (int)(100.0 * p.Current / p.Total) : 0;
+                // Indeterminate reports (throttle waits, inner scan steps) must not
+                // reset the determinate bar to 0%; only update the status message
+                // and flip the bar into marquee mode. The next determinate report
+                // restores % and clears the marquee flag.
+                if (p.IsIndeterminate)
+                {
+                    IsIndeterminate = true;
+                }
+                else
+                {
+                    IsIndeterminate = false;
+                    ProgressValue = p.Total > 0 ? (int)(100.0 * p.Current / p.Total) : 0;
+                }
                 StatusMessage = p.Message;
                 WeakReferenceMessenger.Default.Send(new ProgressUpdatedMessage(p));
             });
             await RunOperationAsync(_cts.Token, progress);
+            // Success path: replace any lingering "Scanning X…" with a neutral
+            // completion marker so stale in-progress labels don't stick around.
+            StatusMessage = TranslationSource.Instance["status.complete"];
+            ProgressValue = 100;
+            IsIndeterminate = false;
         }
         catch (OperationCanceledException)
         {
             StatusMessage = TranslationSource.Instance["status.cancelled"];
+            IsIndeterminate = false;
             _logger.LogInformation("Operation cancelled by user.");
         }
         catch (Exception ex)
         {
             StatusMessage = $"{TranslationSource.Instance["err.generic"]} {ex.Message}";
+            IsIndeterminate = false;
             _logger.LogError(ex, "Operation failed.");
         }
         finally