Refactor codebase resolving warnings and remove self-package imports

lib/model/chatList/chatProps.dart

@@ -0,0 +1,35 @@
+import '../../api/apiResponse.dart';
+import '../../api/marianumcloud/talk/chat/getChatCache.dart';
+import '../../api/marianumcloud/talk/chat/getChatResponse.dart';
+import '../dataHolder.dart';
+
+class ChatProps extends DataHolder {
+  String _queryToken = "";
+
+  GetChatResponse? _getChatResponse;
+  GetChatResponse get getChatResponse => _getChatResponse!;
+
+  @override
+  List<ApiResponse?> properties() {
+    return [_getChatResponse];
+  }
+
+  @override
+  void run() {
+    notifyListeners();
+    GetChatCache(
+      chatToken: _queryToken,
+      onUpdate: (GetChatResponse data) => {
+        _getChatResponse = data,
+        notifyListeners(),
+      }
+    );
+  }
+
+  void setQueryToken(String token) {
+    _queryToken = token;
+    _getChatResponse = null;
+    run();
+  }
+
+}