adopt MarianumConnectQuery base in remaining queries

lib/api/marianumconnect/queries/auth_verify/auth_verify.dart

@@ -2,8 +2,7 @@ import 'package:dio/dio.dart';
 
 import '../../../errors/auth_exception.dart';
 import '../../auth/token_storage.dart';
-import '../../errors/marianumconnect_error.dart';
-import '../../marianumconnect_endpoint.dart';
+import '../../marianumconnect_query.dart';
 
 /// Probes that the stored bearer token still maps to the given credentials.
 /// Server returns 200 only when the credentials belong to the user that the
@@ -12,29 +11,28 @@ import '../../marianumconnect_endpoint.dart';
 ///
 /// Bypasses the shared dio singleton so the auth interceptor doesn't kick in
 /// and obscure a real 401 with a silent re-login.
-class AuthVerify {
+class AuthVerify extends MarianumConnectQuery {
   static const Duration _connectTimeout = Duration(seconds: 10);
   static const Duration _receiveTimeout = Duration(seconds: 15);
 
   final MarianumConnectTokenStorage _tokenStorage;
-  final Dio _dio;
 
   AuthVerify({
     MarianumConnectTokenStorage tokenStorage =
         const MarianumConnectTokenStorage(),
     Dio? dio,
   }) : _tokenStorage = tokenStorage,
-       _dio =
-           dio ??
-           Dio(
-             BaseOptions(
-               connectTimeout: _connectTimeout,
-               sendTimeout: _connectTimeout,
-               receiveTimeout: _receiveTimeout,
-               responseType: ResponseType.json,
-               contentType: 'application/json',
-             ),
-           );
+       super(dio: dio ?? _buildDio());
+
+  static Dio _buildDio() => Dio(
+    BaseOptions(
+      connectTimeout: _connectTimeout,
+      sendTimeout: _connectTimeout,
+      receiveTimeout: _receiveTimeout,
+      responseType: ResponseType.json,
+      contentType: 'application/json',
+    ),
+  );
 
   /// Throws [AuthException] on 401 (credentials no longer match the token's
   /// user, token missing, or token rejected), other [AppException]s on
@@ -49,14 +47,12 @@ class AuthVerify {
         technicalDetails: 'AuthVerify: no bearer token in storage',
       );
     }
-    try {
-      await _dio.post<void>(
-        MarianumConnectEndpoint.resolve('auth/verify'),
+    return guard(() async {
+      await dio.post<void>(
+        endpoint('auth/verify'),
         data: {'username': username, 'password': password},
         options: Options(headers: {'Authorization': 'Bearer $token'}),
       );
-    } on DioException catch (e) {
-      throw mapMarianumConnectError(e);
-    }
+    });
   }
 }