feat: enhance location update feedback and improve message retry error handling

lib/screens/map_screen.dart

@@ -1514,15 +1514,16 @@ class _MapScreenState extends State<MapScreen> {
               title: Text(context.l10n.map_setAsMyLocation),
               onTap: () async {
                 final messenger = ScaffoldMessenger.of(context);
-                final message = context.l10n.settings_locationUpdated;
+                final successMsg = context.l10n.settings_locationUpdated;
                 Navigator.pop(sheetContext);
+                if (!connector.isConnected) return;
                 await connector.setNodeLocation(
                   lat: position.latitude,
                   lon: position.longitude,
                 );
                 await connector.refreshDeviceInfo();
                 if (!mounted) return;
-                messenger.showSnackBar(SnackBar(content: Text(message)));
+                messenger.showSnackBar(SnackBar(content: Text(successMsg)));
               },
             ),
             ListTile(

lib/services/message_retry_service.dart

@@ -184,7 +184,16 @@ class MessageRetryService extends ChangeNotifier {
       final messageId = queue.removeAt(0);
       if (_pendingMessages.containsKey(messageId)) {
         _activeMessages.add(messageId);
-        _attemptSend(messageId);
+        _attemptSend(messageId).catchError((e) {
+          debugPrint('_attemptSend threw for $messageId: $e');
+          final msg = _pendingMessages[messageId];
+          if (msg != null) {
+            final failed = msg.copyWith(status: MessageStatus.failed);
+            _pendingMessages[messageId] = failed;
+            _updateMessageCallback?.call(failed);
+          }
+          _onMessageResolved(messageId, contactKey);
+        });
         return;
       }
       // Message was cancelled/cleaned up while queued — try next