added support for multiple accounts, guardian login bugfixes, ui changes

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

@@ -4,6 +4,7 @@ import '../../../errors/auth_exception.dart';
 import '../../auth/token_storage.dart';
 import '../../marianumconnect_api.dart';
 import '../../marianumconnect_query.dart';
+import '../auth_login/auth_login_response.dart';
 
 /// Probes that the stored bearer token is still accepted. Used for accounts
 /// without a password (guardians), whose token cannot be renewed silently.
@@ -22,9 +23,18 @@ class AuthMe extends MarianumConnectQuery {
 
   /// Throws [AuthException] when the token is missing or rejected.
   Future<void> run() async {
+    await user();
+  }
+
+  /// The signed-in user (names, type). Throws like [run].
+  Future<AuthLoginUser> user() async {
     final options = await _tokenStorage.requireBearerOptions('AuthMe');
     return guard(() async {
-      await dio.get<void>(endpoint('auth/me'), options: options);
+      final response = await dio.get<Map<String, dynamic>>(
+        endpoint('auth/me'),
+        options: options,
+      );
+      return AuthLoginUser.fromJson(response.data!);
     });
   }
 }