fix(notifications): handle deep linking on cold start without crash

apps/mobile_app/lib/core/init_app.dart

@@ -35,6 +35,7 @@ Future<void> initApp(EnvironmentEnum env) async {
   initSfTracking();
 
   configureAppRouter();
+  onRouterReady();
 
   // TODO Fase 2: await initSentry(env);
 

apps/mobile_app/lib/core/notifications_init.dart

@@ -6,15 +6,6 @@ import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 import 'package:navigation/navigation.dart';
 import 'package:sf_app_platform/navigation/app_router.dart';
 
-/// Background message handler. MUST be a top-level function annotated with
-/// `@pragma('vm:entry-point')` so the Flutter engine can dispatch it from a
-/// background isolate when the app is terminated or backgrounded.
-///
-/// This runs in a separate isolate: it CANNOT access main-isolate state
-/// (providers, GetIt, navigation). Keep it side-effect free or schedule work
-/// via shared_preferences. Do not call `Firebase.initializeApp` here —
-/// firebase_messaging 14+ auto-initializes the default app for the background
-/// isolate.
 @pragma('vm:entry-point')
 Future<void> firebaseMessagingBackgroundHandler(RemoteMessage message) async {
   debugPrint('[FCM-bg] messageId: ${message.messageId}');
@@ -30,6 +21,9 @@ const String _localChannelDescription =
 final FlutterLocalNotificationsPlugin _localNotifications =
     FlutterLocalNotificationsPlugin();
 
+Map<String, dynamic>? _pendingNotificationData;
+bool _routerReady = false;
+
 Future<void> setupNotifications() async {
   final messaging = FirebaseMessaging.instance;
 
@@ -66,10 +60,19 @@ Future<void> setupNotifications() async {
   }
 }
 
+void onRouterReady() {
+  _routerReady = true;
+  final pending = _pendingNotificationData;
+  if (pending != null) {
+    _pendingNotificationData = null;
+    _handleNotificationNavigation(pending);
+  }
+}
+
 Future<void> _initLocalNotifications() async {
   const androidInit = AndroidInitializationSettings('@mipmap/ic_launcher');
   const iosInit = DarwinInitializationSettings(
-    requestAlertPermission: false, // already requested via FirebaseMessaging
+    requestAlertPermission: false,
     requestBadgePermission: false,
     requestSoundPermission: false,
   );
@@ -83,7 +86,6 @@ Future<void> _initLocalNotifications() async {
     onDidReceiveNotificationResponse: _onLocalNotificationTapped,
   );
 
-  // Android 8+ requires every notification to belong to a channel.
   const channel = AndroidNotificationChannel(
     _localChannelId,
     _localChannelName,
@@ -153,6 +155,12 @@ void _onLocalNotificationTapped(NotificationResponse response) {
 }
 
 void _handleNotificationNavigation(Map<String, dynamic> data) {
+  if (!_routerReady) {
+    _pendingNotificationData = data;
+    debugPrint('[Notification] router not ready, queued for later');
+    return;
+  }
+
   final currentLocation =
       appRouter.routerDelegate.currentConfiguration.uri.path;
   if (!currentLocation.startsWith(AppRoutes.legacyDashboard)) return;