added guardian login with views for their assigned childs

lib/api/marianumconnect/queries/auth_me/auth_me.dart

@@ -0,0 +1,30 @@
+import 'package:dio/dio.dart';
+
+import '../../../errors/auth_exception.dart';
+import '../../auth/token_storage.dart';
+import '../../marianumconnect_api.dart';
+import '../../marianumconnect_query.dart';
+
+/// Probes that the stored bearer token is still accepted. Used for accounts
+/// without a password (guardians), whose token cannot be renewed silently.
+///
+/// Bypasses the shared dio singleton so the auth interceptor does not react
+/// to the 401 this probe is meant to observe.
+class AuthMe extends MarianumConnectQuery {
+  final MarianumConnectTokenStorage _tokenStorage;
+
+  AuthMe({
+    MarianumConnectTokenStorage tokenStorage =
+        const MarianumConnectTokenStorage(),
+    Dio? dio,
+  }) : _tokenStorage = tokenStorage,
+       super(dio: dio ?? MarianumConnectApi.plainDio());
+
+  /// Throws [AuthException] when the token is missing or rejected.
+  Future<void> run() async {
+    final options = await _tokenStorage.requireBearerOptions('AuthMe');
+    return guard(() async {
+      await dio.get<void>(endpoint('auth/me'), options: options);
+    });
+  }
+}