detail page item add dialog

lib/services/dbhelper.dart

@@ -2,6 +2,7 @@ import 'package:flutter_dotenv/flutter_dotenv.dart';
 import 'package:supabase_flutter/supabase_flutter.dart';
 import '../assets/example_data.dart' as ed;
 import '../models/checklist.dart';
+import '../models/listitem.dart';
 
 class DbHelper {
   static late final SupabaseClient _client;
@@ -38,6 +39,11 @@ class DbHelper {
     return ed.checklists.first;
   }
 
+  static Future<void> addOrUpdateItem(
+      int checklistId, String title, String description, int? itemId) async {
+    // TODO implement addOrUpdateItem
+  }
+
   static Stream<AuthState> get authChangeEventStream =>
       _client.auth.onAuthStateChange;
 }