Notification Screen and tasq_adaptive_list enhancements

lib/providers/notifications_provider.dart

@@ -317,6 +317,21 @@ class NotificationsController {
     }
   }
 
+  /// Mark all unread notifications for the current user as read.
+  Future<void> markAllRead() async {
+    final userId = _client.auth.currentUser?.id;
+    if (userId == null) return;
+    try {
+      await _client
+          .from('notifications')
+          .update({'read_at': AppTime.nowUtc().toIso8601String()})
+          .eq('user_id', userId)
+          .filter('read_at', 'is', null);
+    } catch (e) {
+      if (!isOfflineSaveError(e)) rethrow;
+    }
+  }
+
   Future<void> registerFcmToken(String token) async {
     final userId = _client.auth.currentUser?.id;
     if (userId == null) return;