fix: upload progress bar flickering

mobile/lib/providers/app_life_cycle.provider.dart

@@ -155,14 +155,10 @@ class AppLifeCycleNotifier extends StateNotifier<AppLifeCycleEnum> {
         _safeRun(backgroundManager.syncRemote().then((success) => syncSuccess = success), "syncRemote"),
       ]);
       if (syncSuccess) {
-        await Future.wait([
-          _safeRun(backgroundManager.hashAssets(), "hashAssets").then((_) {
-            _resumeBackup();
-          }),
-          _resumeBackup(),
-          // TODO: Bring back when the soft freeze issue is addressed
-          // _safeRun(backgroundManager.syncCloudIds(), "syncCloudIds"),
-        ]);
+        await _safeRun(backgroundManager.hashAssets(), "hashAssets");
+        // TODO: Bring back when the soft freeze issue is addressed
+        // await _safeRun(backgroundManager.syncCloudIds(), "syncCloudIds");
+        await _resumeBackup();
       } else {
         await _safeRun(backgroundManager.hashAssets(), "hashAssets");
       }

mobile/lib/providers/backup/drift_backup.provider.dart

@@ -259,6 +259,11 @@ class DriftBackupNotifier extends StateNotifier<DriftBackupState> {
   }
 
   Future<void> startForegroundBackup(String userId) async {
+    // Cancel any existing backup before starting a new one
+    if (state.cancelToken != null) {
+      await stopForegroundBackup();
+    }
+
     state = state.copyWith(error: BackupError.none);
 
     final cancelToken = CancellationToken();