[mob][photos] Show when clustering is running

mobile/lib/services/machine_learning/face_ml/face_ml_service.dart

@@ -91,7 +91,10 @@ class FaceMlService {
   bool isInitialized = false;
   late String client;
 
+  bool get showClusteringIsHappening => _showClusteringIsHappening;
+
   bool debugIndexingDisabled = false;
+  bool _showClusteringIsHappening = false;
   bool _mlControllerStatus = false;
   bool _isIndexingOrClusteringRunning = false;
   bool _shouldPauseIndexingAndClustering = false;
@@ -572,6 +575,8 @@ class FaceMlService {
     await PersonService.instance.fetchRemoteClusterFeedback();
 
     try {
+      _showClusteringIsHappening = true;
+
       // Get a sense of the total number of faces in the database
       final int totalFaces =
           await FaceMLDataDB.instance.getTotalFaceCount(minFaceScore: minFaceScore);
@@ -711,6 +716,7 @@ class FaceMlService {
     } catch (e, s) {
       _logger.severe("`clusterAllImages` failed", e, s);
     } finally {
+      _showClusteringIsHappening = false;
       _isIndexingOrClusteringRunning = false;
       _shouldPauseIndexingAndClustering = false;
     }

mobile/lib/ui/settings/machine_learning_settings_page.dart

@@ -513,14 +513,18 @@ class FaceRecognitionStatusWidgetState extends State<FaceRecognitionStatusWidget
                       title: S.of(context).clusteringProgress,
                     ),
                     trailingWidget: Text(
-                      "${clusteringPercentage.toStringAsFixed(0)}%",
+                      FaceMlService.instance.showClusteringIsHappening
+                          ? "currently running"
+                          : "${clusteringPercentage.toStringAsFixed(0)}%",
                       style: Theme.of(context).textTheme.bodySmall,
                     ),
                     singleBorderRadius: 8,
                     alignCaptionedTextToLeft: true,
                     isGestureDetectorDisabled: true,
                     key: ValueKey(
-                      "clustering_progress_" + clusteringPercentage.toStringAsFixed(0),
+                      FaceMlService.instance.showClusteringIsHappening
+                          ? "currently running"
+                          : "clustering_progress_" + clusteringPercentage.toStringAsFixed(0),
                     ),
                   ),
                 ],