finished notification fix

refilc/lib/utils/navigation_service.dart

@@ -0,0 +1,9 @@
+import 'package:flutter/material.dart';
+
+class NavigationService {
+  final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
+
+  Future<dynamic> navigateTo(String routeName) {
+    return navigatorKey.currentState!.pushNamed(routeName);
+  }
+}