Add sync status to app drawer

lib/core/services/sync_service.dart

@@ -11,12 +11,16 @@ class SyncResult {
   final bool isOnline;
   final int changesSynced;
   final int annotationsSynced;
+  final int changesUnsynced;
+  final int annotationsUnsynced;
 
   SyncResult({
     required this.sheets,
     required this.isOnline,
-    this.changesSynced = 0,
-    this.annotationsSynced = 0,
+    required this.changesSynced,
+    required this.annotationsSynced,
+    required this.changesUnsynced,
+    required this.annotationsUnsynced,
   });
 }
 
@@ -35,8 +39,8 @@ class SyncService {
   SyncService({
     required ApiClient apiClient,
     required StorageService storageService,
-  })  : _apiClient = apiClient,
-        _storageService = storageService;
+  }) : _apiClient = apiClient,
+       _storageService = storageService;
 
   /// Performs a full sync operation.
   ///
@@ -80,6 +84,8 @@ class SyncService {
 
     // 3. Upload pending annotations
     annotationsSynced = await _uploadPendingAnnotations();
+    final remainingAnnotations = await _storageService
+        .readPendingAnnotationUploads();
 
     // 4. Apply any remaining local changes (in case some failed to upload)
     final changeQueue = await _storageService.readChangeQueue();
@@ -102,6 +108,8 @@ class SyncService {
       isOnline: true,
       changesSynced: changesSynced,
       annotationsSynced: annotationsSynced,
+      changesUnsynced: changeQueue.length,
+      annotationsUnsynced: remainingAnnotations.length,
     );
   }
 
@@ -127,9 +135,16 @@ class SyncService {
       }
     }
 
+    final remainingAnnotations = await _storageService
+        .readPendingAnnotationUploads();
+
     return SyncResult(
       sheets: sheets,
       isOnline: false,
+      changesSynced: 0,
+      annotationsSynced: 0,
+      changesUnsynced: changeQueue.length,
+      annotationsUnsynced: remainingAnnotations.length,
     );
   }