adopt MarianumConnectQuery base in remaining queries

lib/api/marianumconnect/queries/get_ticker/get_ticker.dart

@@ -1,25 +1,13 @@
-import 'package:dio/dio.dart';
-
-import '../../errors/marianumconnect_error.dart';
-import '../../marianumconnect_api.dart';
-import '../../marianumconnect_endpoint.dart';
+import '../../marianumconnect_query.dart';
 import 'get_ticker_response.dart';
 
 /// Fetches the current "Aktuelles" ticker post from
 /// `GET /api/mobile/v1/ticker`. Bearer token is attached by the shared dio.
-class GetTicker {
-  final Dio _dio;
+class GetTicker extends MarianumConnectQuery {
+  GetTicker({super.dio});
 
-  GetTicker({Dio? dio}) : _dio = dio ?? MarianumConnectApi.dio();
-
-  Future<TickerResponse> run() async {
-    try {
-      final response = await _dio.get<Map<String, dynamic>>(
-        MarianumConnectEndpoint.resolve('ticker'),
-      );
-      return TickerResponse.fromJson(response.data!);
-    } on DioException catch (e) {
-      throw mapMarianumConnectError(e);
-    }
-  }
+  Future<TickerResponse> run() => guard(() async {
+    final response = await dio.get<Map<String, dynamic>>(endpoint('ticker'));
+    return TickerResponse.fromJson(response.data!);
+  });
 }