fix warning

mobile/lib/domain/services/background_worker.service.dart

@@ -104,7 +104,7 @@ class BackgroundWorkerBgService extends BackgroundWorkerFlutterApi {
       await _backgroundHostApi.close();
     } catch (error, stack) {
       _logger.severe("Failed to initialize background worker", error, stack);
-      _backgroundHostApi.close();
+      await _backgroundHostApi.close();
     }
   }
 

mobile/lib/domain/services/local_sync.service.dart

@@ -254,7 +254,7 @@ class LocalSyncService {
 
       if (assetsToUpsert.isEmpty && assetsToDelete.isEmpty) {
         _log.fine("No asset changes detected in album ${deviceAlbum.name}. Updating metadata.");
-        _localAlbumRepository.upsert(updatedDeviceAlbum);
+        await _localAlbumRepository.upsert(updatedDeviceAlbum);
         return true;
       }