added guardian login with views for their assigned childs

lib/routing/app_routes.dart

@@ -9,8 +9,8 @@ import '../api/marianumcloud/talk/room/get_room_response.dart';
 import '../api/marianumconnect/marianumconnect_endpoint.dart';
 import '../api/marianumconnect/queries/timetable_get_element_week/timetable_element_type.dart';
 import '../main.dart';
-import '../model/account_data.dart';
 import '../notification/notification_tasks.dart';
+import '../session/session_manager.dart';
 import '../share_intent/pending_share.dart';
 import '../share_intent/remote_file_ref.dart';
 import '../state/app/modules/app_modules.dart';
@@ -374,7 +374,10 @@ class AppRoutes {
     // ChatBloc._loadChat with the freshly-fetched maxId — sending one
     // here too with the chat list's possibly-stale room.lastMessage.id
     // would race the fresh one and could regress the server cursor.
-    context.read<ChatListBloc>().markRoomAsRead(room.token, room.lastMessage.id);
+    context.read<ChatListBloc>().markRoomAsRead(
+      room.token,
+      room.lastMessage.id,
+    );
     NotificationTasks.clearNotificationsForChat(room.token);
     TalkNavigator.pushSplitView(
       context,
@@ -404,7 +407,8 @@ class AppRoutes {
   static ResolvedPendingChat? resolvePendingChat(BuildContext context) {
     final token = pendingChatToken.value;
     if (token == null) return null;
-    if (!AccountData().isPopulated()) return null;
+    final nextcloud = SessionManager().current?.nextcloud;
+    if (nextcloud == null) return null;
 
     final rooms = context.read<ChatListBloc>().state.data?.rooms;
     final room = _findRoomByToken(rooms, token);
@@ -417,7 +421,7 @@ class AppRoutes {
     );
     return ResolvedPendingChat(
       room: room,
-      selfId: AccountData().getUsername(),
+      selfId: nextcloud.username,
       avatar: avatar,
     );
   }