added guardian login with views for their assigned childs

lib/api/errors/error_mapper.dart

@@ -5,6 +5,7 @@ import 'package:dio/dio.dart';
 import 'package:http/http.dart' as http;
 import 'package:nextcloud/nextcloud.dart';
 
+import '../../session/session.dart';
 import '../api_error.dart';
 import '../http_errors.dart';
 import '../marianumcloud/talk/talk_error.dart';
@@ -61,7 +62,9 @@ AppException? _dioToAppException(DioException error) {
 AppException _dynamiteToAppException(DynamiteApiException error) {
   final status = error.statusCode;
   final preview = previewBody(error.body);
-  final detail = preview.isEmpty ? 'HTTP $status' : 'HTTP $status body=$preview';
+  final detail = preview.isEmpty
+      ? 'HTTP $status'
+      : 'HTTP $status body=$preview';
   switch (status) {
     case 401:
       return AuthException.unauthorized(technicalDetails: detail);
@@ -86,6 +89,9 @@ String errorToUserMessage(Object? error, {String fallback = _defaultFallback}) {
   if (error is AppException) return error.userMessage;
 
   if (error is TalkError) return TalkException(error).userMessage;
+  if (error is NextcloudUnavailableException) {
+    return 'Diese Funktion ist mit deinem Konto nicht verfügbar.';
+  }
 
   if (error is DioException) {
     final mapped = _dioToAppException(error);
@@ -136,6 +142,7 @@ String? errorToTechnicalDetails(Object? error) {
 bool errorAllowsRetry(Object? error) {
   if (error == null) return true;
   if (error is AppException) return error.allowRetry;
+  if (error is NextcloudUnavailableException) return false;
   if (error is DioException) {
     final mapped = _dioToAppException(error);
     if (mapped != null) return mapped.allowRetry;