replay pending notification tap after login

lib/providers/user.dart

@@ -14,6 +14,7 @@ import 'package:didvan/services/auth/token_storage.dart';
 import 'package:didvan/services/network/request.dart';
 import 'package:didvan/services/network/request_helper.dart';
 import 'package:didvan/services/notification/firebase_api.dart';
+import 'package:didvan/services/notification/notification_service.dart';
 import 'package:didvan/services/storage/storage.dart';
 import 'package:didvan/utils/action_sheet.dart';
 
@@ -188,6 +189,13 @@ class UserProvider extends CoreProvier {
       // ignore: discarded_futures
       fetchWelcomeMessage();
 
+      // If the user reached us via a notification tap while logged out,
+      // splash stashed the payload. Now that we're authenticated, replay
+      // it so they land on the right detail screen instead of staying on
+      // the home page.
+      // ignore: discarded_futures
+      NotificationService.consumePendingNotificationTap();
+
       return true;
     } catch (e) {
       print("UserProvider: Exception processing user info: $e");

lib/services/notification/notification_service.dart

@@ -72,6 +72,24 @@ class NotificationService {
     }
   }
 
+  /// Save a notification payload into cross-isolate storage so it can be
+  /// replayed later (e.g. after the user logs in). Used by splash when the
+  /// user tapped a notification while logged out — we don't want to drop
+  /// the destination just because they need to sign in first.
+  static Future<void> stashPendingNotificationPayload(
+      NotificationMessage data) async {
+    try {
+      await HomeWidget.saveWidgetData(
+        pendingNotificationPayloadKey,
+        jsonEncode(data.toJson()),
+      );
+    } catch (e) {
+      if (kDebugMode) {
+        print('stashPendingNotificationPayload failed: $e');
+      }
+    }
+  }
+
   /// Read a pending notification payload (if any) from cross-isolate
   /// storage and hand it off to [HomeWidgetRepository.data] without
   /// navigating. Use this during splash where you want the existing splash

lib/views/splash/splash.dart

@@ -378,6 +378,18 @@ class _SplashState extends State<Splash> with SingleTickerProviderStateMixin {
       return;
     }
 
+    // User tapped a notification but isn't logged in — stash the payload
+    // back into cross-isolate storage so we can replay it after a
+    // successful login (see UserProvider.getUserInfo).
+    if (token == null && HomeWidgetRepository.data != null) {
+      try {
+        await NotificationService.stashPendingNotificationPayload(
+          HomeWidgetRepository.data!,
+        );
+      } catch (_) {/* best effort */}
+      HomeWidgetRepository.data = null;
+    }
+
     Navigator.of(context).pushReplacementNamed(
       destinationRoute,
       arguments: routeArguments,