adopt MarianumConnectQuery base in remaining queries

lib/api/marianumconnect/queries/get_breakers/get_breakers.dart

@@ -1,26 +1,14 @@
-import 'package:dio/dio.dart';
-
-import '../../errors/marianumconnect_error.dart';
-import '../../marianumconnect_api.dart';
-import '../../marianumconnect_endpoint.dart';
+import '../../marianumconnect_query.dart';
 import 'get_breakers_response.dart';
 
 /// Fetches the app maintenance breaker rules from `GET /api/mobile/v1/breaker`.
 /// The endpoint is public: the bearer token is attached if present but not
 /// required, so this also works before login (e.g. to block the whole app).
-class GetBreakers {
-  final Dio _dio;
+class GetBreakers extends MarianumConnectQuery {
+  GetBreakers({super.dio});
 
-  GetBreakers({Dio? dio}) : _dio = dio ?? MarianumConnectApi.dio();
-
-  Future<GetBreakersResponse> run() async {
-    try {
-      final response = await _dio.get<Map<String, dynamic>>(
-        MarianumConnectEndpoint.resolve('breaker'),
-      );
-      return GetBreakersResponse.fromJson(response.data!);
-    } on DioException catch (e) {
-      throw mapMarianumConnectError(e);
-    }
-  }
+  Future<GetBreakersResponse> run() => guard(() async {
+    final response = await dio.get<Map<String, dynamic>>(endpoint('breaker'));
+    return GetBreakersResponse.fromJson(response.data!);
+  });
 }