added guardian login with views for their assigned childs

lib/api/marianumconnect/queries/absence/absence_submit.dart

@@ -3,7 +3,8 @@ import '../../marianumconnect_query.dart';
 /// Submits an absence report (`POST absence`, bearer-auth, `source=mobile`).
 /// Empty identity fields are backfilled from LDAP server-side; validation
 /// (all fields required, class must exist, no past start date, end >= start)
-/// also runs server-side and mirrors the client checks.
+/// also runs server-side and mirrors the client checks. For guardians the
+/// server takes name and class from the child given by [childId].
 class AbsenceSubmit extends MarianumConnectQuery {
   AbsenceSubmit({super.dio});
 
@@ -15,6 +16,7 @@ class AbsenceSubmit extends MarianumConnectQuery {
     required DateTime absentUntil,
     required String phone,
     required String note,
+    String? childId,
   }) => guard(() async {
     await dio.post<void>(
       endpoint('absence'),
@@ -26,6 +28,7 @@ class AbsenceSubmit extends MarianumConnectQuery {
         'absentUntil': isoDate(absentUntil),
         'phone': phone,
         'note': note,
+        'childId': ?childId,
       },
     );
   });