finished notification fix

refilc/lib/utils/service_locator.dart

@@ -0,0 +1,8 @@
+import 'package:get_it/get_it.dart';
+import 'package:refilc/utils/navigation_service.dart';
+
+GetIt locator = GetIt.instance;
+
+void setupLocator() {
+  locator.registerLazySingleton(() => NavigationService());
+}