added guardian login with views for their assigned childs

lib/api/marianumcloud/app_password/get_app_password.dart

@@ -2,13 +2,13 @@ import 'dart:convert';
 
 import 'package:http/http.dart' as http;
 
-import '../../../model/account_data.dart';
+import '../../../session/session_manager.dart';
 import '../../http_errors.dart';
 import '../nextcloud_ocs.dart';
 
 /// Exchanges the user's real Nextcloud password for a scoped app password via
 /// `GET /ocs/v2.php/core/getapppassword`. All subsequent Nextcloud calls then
-/// authenticate with the app password (see [AccountData.getBasicAuthHeader]),
+/// authenticate with the app password (see [NextcloudCredentials.basicAuthHeader]),
 /// which is what the push-v2 registration binds to.
 ///
 /// Must authenticate with the *real* password — an app password cannot mint
@@ -33,7 +33,9 @@ class GetAppPassword {
           // Deliberately NOT the shared Authorization value: that one prefers
           // the app password, but an app password cannot mint another one —
           // this endpoint requires the real password.
-          'Authorization': AccountData().getRealPasswordBasicAuthHeader(),
+          'Authorization': SessionManager()
+              .requireNextcloud()
+              .realPasswordBasicAuthHeader,
         },
       ),
     ))!;