add sentry

lib/core/services/onesignal_service.dart

@@ -4,12 +4,16 @@ import 'package:onesignal_flutter/onesignal_flutter.dart';
 /// OneSignal service for managing push notifications and external user ID.
 ///
 /// This service handles:
+/// - Initializing OneSignal SDK
 /// - Setting external user ID after login (using phone number)
 /// - Restoring external user ID on app startup
 /// - Clearing external user ID on logout
 ///
 /// Usage:
 /// ```dart
+/// // Initialize in main.dart
+/// await OneSignalService.init(appId: 'your-app-id');
+///
 /// // After successful login
 /// await OneSignalService.login(phoneNumber);
 ///
@@ -19,6 +23,78 @@ import 'package:onesignal_flutter/onesignal_flutter.dart';
 class OneSignalService {
   OneSignalService._();
 
+  /// OneSignal App ID - Replace with your actual App ID from OneSignal dashboard
+  static const String _defaultAppId = '778ca22d-c719-4ec8-86cb-a6b911166066';
+
+  /// Initialize OneSignal SDK
+  ///
+  /// Must be called before using any other OneSignal methods.
+  /// Sets up push subscription observers and requests notification permission.
+  ///
+  /// [appId] - Optional App ID override (uses default if not provided)
+  /// [requestPermission] - Whether to request notification permission (default: true)
+  static Future<void> init({
+    String? appId,
+    bool requestPermission = true,
+  }) async {
+    try {
+      // Set debug log level (verbose in debug, none in release)
+      OneSignal.Debug.setLogLevel(kDebugMode ? OSLogLevel.verbose : OSLogLevel.none);
+
+      // Initialize with App ID
+      OneSignal.initialize(appId ?? _defaultAppId);
+      debugPrint('🔔 OneSignal initialized');
+
+      // Add push subscription observer to track subscription state changes
+      OneSignal.User.pushSubscription.addObserver((state) {
+        debugPrint('🔔 Push subscription state changed:');
+        debugPrint('  Previous - optedIn: ${state.previous.optedIn}, id: ${state.previous.id}');
+        debugPrint('  Current - optedIn: ${state.current.optedIn}, id: ${state.current.id}');
+        debugPrint('  Subscription ID: ${state.current.id}');
+        debugPrint('  Push Token: ${state.current.token}');
+
+        if (state.current.id != null) {
+          debugPrint('🔔 ✅ Device successfully subscribed!');
+        }
+      });
+
+      // Add notification permission observer
+      OneSignal.Notifications.addPermissionObserver((isGranted) {
+        debugPrint('🔔 Notification permission changed: $isGranted');
+      });
+
+      // Request permission if enabled
+      if (requestPermission) {
+        final accepted = await OneSignal.Notifications.requestPermission(true);
+        debugPrint('🔔 Permission request result: $accepted');
+      }
+
+      // Give OneSignal SDK time to complete initialization and server registration
+      await Future<void>.delayed(const Duration(seconds: 2));
+
+      // Log current subscription status
+      _logSubscriptionStatus();
+    } catch (e) {
+      debugPrint('🔔 OneSignal error: Failed to initialize - $e');
+    }
+  }
+
+  /// Log current subscription status for debugging
+  static void _logSubscriptionStatus() {
+    final optedIn = OneSignal.User.pushSubscription.optedIn;
+    final id = OneSignal.User.pushSubscription.id;
+    final token = OneSignal.User.pushSubscription.token;
+
+    debugPrint('🔔 Current subscription status:');
+    debugPrint('  Opted In: $optedIn');
+    debugPrint('  Subscription ID: $id');
+    debugPrint('  Push Token: $token');
+
+    if (id == null) {
+      debugPrint('🔔 ⚠️  Subscription ID is null - check device connectivity and OneSignal app ID');
+    }
+  }
+
   /// Login user to OneSignal by setting external user ID.
   ///
   /// This associates the device with the user's phone number,