fix foreground service and add notification nav

wraps MaterialApp in WithForegroundService to keep alive when swiped away

persists last connected device and clears on manual disconnect to allow
reconnect after kill

added lifecycle tracking to iOS and keep android notification alive with
heartbeat

add notification navigation

change screen tests to be less brittle

address PR commnets

lib/screens/discovery_screen.dart

@@ -8,6 +8,7 @@ import '../connector/meshcore_connector.dart';
 import '../connector/meshcore_protocol.dart';
 import '../l10n/l10n.dart';
 import '../models/contact.dart';
+import '../services/notification_service.dart';
 import '../utils/contact_search.dart';
 import '../utils/platform_info.dart';
 import '../widgets/app_bar.dart';
@@ -31,6 +32,20 @@ class _DiscoveryScreenState extends State<DiscoveryScreen> {
   DiscoverySortOption discoverySortOption = DiscoverySortOption.lastSeen;
   Timer? _searchDebounce;
 
+  @override
+  void initState() {
+    super.initState();
+    _clearAdvertNotifications();
+  }
+
+  void _clearAdvertNotifications() {
+    final connector = context.read<MeshCoreConnector>();
+    final ids = connector.allContacts.map((c) => c.publicKeyHex).toList();
+    final ns = NotificationService();
+    ns.clearAllAdvertNotifications();
+    ns.clearAdvertNotifications(ids);
+  }
+
   @override
   void dispose() {
     _searchController.dispose();

lib/screens/scanner_screen.dart

@@ -7,6 +7,7 @@ import 'package:provider/provider.dart';
 import '../connector/meshcore_connector.dart';
 import '../l10n/l10n.dart';
 import '../services/linux_ble_error_classifier.dart';
+import '../services/notification_service.dart';
 import '../utils/app_logger.dart';
 import '../widgets/adaptive_app_bar_title.dart';
 import '../widgets/device_tile.dart';
@@ -43,6 +44,10 @@ class _ScannerScreenState extends State<ScannerScreen> {
           isCurrentRoute &&
           !_changedNavigation) {
         _changedNavigation = true;
+        // Prompt for notification permission on first
+        // connect so notifications work out of the box
+        // on Android 13+.
+        NotificationService().requestPermissions();
         if (mounted) {
           Navigator.of(context).push(
             MaterialPageRoute(builder: (context) => const ContactsScreen()),
@@ -53,6 +58,12 @@ class _ScannerScreenState extends State<ScannerScreen> {
 
     _connector.addListener(_connectionListener);
 
+    // If the app was killed (swipe-away) and relaunched, try to reconnect
+    // to the last known device so the user doesn't have to scan again.
+    if (_connector.state == MeshCoreConnectionState.disconnected) {
+      _connector.tryAutoReconnect();
+    }
+
     _bluetoothStateSubscription = FlutterBluePlus.adapterState.listen(
       (state) {
         if (mounted) {