migrated timetable integration from WebUntis to the MarianumConnect API, implementing a Dio-based client with bearer token authentication, background session validation, and auto-refresh logic.

lib/api/errors/error_mapper.dart

@@ -6,13 +6,11 @@ import 'package:http/http.dart' as http;
 
 import '../api_error.dart';
 import '../marianumcloud/talk/talk_error.dart';
-import '../webuntis/webuntis_error.dart';
 import 'app_exception.dart';
 import 'network_exception.dart';
 import 'parse_exception.dart';
 import 'server_exception.dart';
 import 'talk_exception.dart';
-import 'webuntis_exception.dart';
 
 const String _defaultFallback =
     'Etwas ist schiefgelaufen. Bitte versuche es erneut.';
@@ -57,7 +55,6 @@ 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 WebuntisError) return WebuntisException(error).userMessage;
 
   if (error is DioException) {
     final mapped = _dioToAppException(error);
@@ -90,7 +87,6 @@ String? errorToTechnicalDetails(Object? error) {
   if (error == null) return null;
   if (error is AppException) return error.technicalDetails ?? error.toString();
   if (error is TalkError) return TalkException(error).technicalDetails;
-  if (error is WebuntisError) return WebuntisException(error).technicalDetails;
   if (error is DioException) {
     final mapped = _dioToAppException(error);
     if (mapped != null) return mapped.technicalDetails ?? mapped.toString();