OTA Update attempt

lib/main.dart

@@ -18,6 +18,9 @@ import 'utils/location_permission.dart';
 import 'services/notification_service.dart';
 import 'services/notification_bridge.dart';
 import 'services/background_location_service.dart';
+import 'services/app_update_service.dart';
+import 'widgets/update_dialog.dart';
+import 'utils/navigation.dart';
 import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 import 'dart:convert';
 import 'package:shared_preferences/shared_preferences.dart';
@@ -594,6 +597,23 @@ Future<void> main() async {
     ),
   );
 
+  // perform update check once the first frame has rendered; errors are
+  // intentionally swallowed so a network outage doesn't block startup.
+  WidgetsBinding.instance.addPostFrameCallback((_) async {
+    try {
+      final info = await AppUpdateService.instance.checkForUpdate();
+      if (info.isUpdateAvailable) {
+        showDialog(
+          context: globalNavigatorKey.currentContext!,
+          barrierDismissible: !info.isForceUpdate,
+          builder: (_) => UpdateDialog(info: info),
+        );
+      }
+    } catch (e) {
+      debugPrint('update check failed: $e');
+    }
+  });
+
   // Post-startup registration removed: token registration is handled
   // centrally in the auth state change listener to avoid duplicate inserts.
 }