fixed notification taps being ignored when they cold-started the app

lib/notification/notification_tasks.dart

@@ -7,6 +7,7 @@ import 'package:flutter_app_badge/flutter_app_badge.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 
 import '../push/chat_thread_store.dart';
+import '../push/push_target.dart';
 import '../routing/app_routes.dart';
 import '../state/app/modules/chat_list/bloc/chat_list_bloc.dart';
 import 'notification_service.dart';
@@ -72,6 +73,20 @@ class NotificationTasks {
     context.read<ChatListBloc>().refresh();
   }
 
+  /// [title] is the notification title, when the tap came with one.
+  static void openPushTarget(
+    BuildContext context,
+    PushTarget target, {
+    String? title,
+  }) {
+    switch (target) {
+      case NewsletterTarget(:final newsletterId):
+        AppRoutes.openNewsletterById(context, id: newsletterId, title: title);
+      case ChatTarget(:final chatToken):
+        navigateToTalk(context, chatToken: chatToken);
+    }
+  }
+
   /// Switches to the Talk tab. If [chatToken] is provided, also schedules
   /// the matching chat to be opened automatically once the chat list view
   /// resolves the token (handled inside [ChatList]).