claude refactorings, flutter best practices, platform dependent changes, general cleanup

lib/view/pages/talk/search_chat.dart

@@ -1,9 +1,9 @@
 import 'package:flutter/material.dart';
 
-import '../../../api/marianumcloud/talk/room/getRoomResponse.dart';
+import '../../../api/marianumcloud/talk/room/get_room_response.dart';
 import 'widgets/chat_tile.dart';
 
-class SearchChat extends SearchDelegate {
+class SearchChat extends SearchDelegate<GetRoomResponseObject?> {
   List<GetRoomResponseObject> chats;
 
   SearchChat(this.chats);