Fix notification delivery and settings flows

lib/data/services/notification_service.dart

@@ -4,10 +4,36 @@ import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 import 'package:timezone/data/latest.dart' as tz_data;
 import 'package:timezone/timezone.dart' as tz;
 
+import '../../app/router.dart';
 import '../local/models/app_settings.dart';
 import 'notification_analytics_service.dart';
 import 'notification_runtime_service.dart';
 
+@pragma('vm:entry-point')
+void notificationTapBackgroundHandler(NotificationResponse response) {
+  // Background isolates cannot safely drive GoRouter. Foreground/cold-start
+  // taps are handled by NotificationService after the app is initialized.
+}
+
+String? routeForNotificationPayload(String? payload) {
+  final type = (payload ?? '').split('|').first.trim().toLowerCase();
+  switch (type) {
+    case 'report':
+    case 'checklist':
+      return '/checklist';
+    case 'adhan':
+    case 'iqamah':
+      return '/';
+    case 'remote':
+    case 'content':
+    case 'streak_risk':
+    case 'system':
+      return '/notifications';
+    default:
+      return null;
+  }
+}
+
 class NotificationPermissionStatus {
   const NotificationPermissionStatus({
     required this.notificationsAllowed,
@@ -148,11 +174,37 @@ class NotificationService {
       macOS: darwinSettings,
     );
 
-    await _plugin.initialize(settings: settings);
+    await _plugin.initialize(
+      settings: settings,
+      onDidReceiveNotificationResponse: _handleNotificationResponse,
+      onDidReceiveBackgroundNotificationResponse:
+          notificationTapBackgroundHandler,
+    );
     await _requestPermissions();
+    await _handleLaunchNotification();
     _initialized = true;
   }
 
+  Future<void> _handleLaunchNotification() async {
+    final details = await _plugin.getNotificationAppLaunchDetails();
+    final response = details?.notificationResponse;
+    if (response == null) return;
+    _routeFromPayload(response.payload);
+  }
+
+  void _handleNotificationResponse(NotificationResponse response) {
+    _routeFromPayload(response.payload);
+  }
+
+  void _routeFromPayload(String? payload) {
+    final route = routeForNotificationPayload(payload);
+    if (route == null) return;
+
+    Future<void>.delayed(Duration.zero, () {
+      appRouter.go(route);
+    });
+  }
+
   void _configureLocalTimeZone() {
     final tzId = _resolveTimeZoneIdByOffset(DateTime.now().timeZoneOffset);
     try {
@@ -532,7 +584,10 @@ class NotificationService {
     final pending = await _plugin.pendingNotificationRequests();
     for (final request in pending) {
       final id = request.id;
-      final isPrayerSchedule = id >= 100000 && id < 900000;
+      // Adhan IDs: 100000..799999
+      // Iqamah IDs: 800000..1499999
+      // Report IDs: 700000..789999
+      final isPrayerSchedule = id >= 100000 && id < 1500000;
       if (isPrayerSchedule) {
         await _plugin.cancel(id: id);
       }