added guardian login with views for their assigned childs

lib/api/marianumconnect/queries/timetable_get_child_week/timetable_get_child_week.dart

@@ -0,0 +1,18 @@
+import '../../marianumconnect_query.dart';
+import '../timetable_get_week/timetable_get_week_response.dart';
+
+/// Fetches the weekly timetable of a guardian's child from
+/// `timetable/child/{childId}`. Same response shape as `timetable/me`.
+class TimetableGetChildWeek extends MarianumConnectQuery {
+  TimetableGetChildWeek({super.dio});
+
+  Future<TimetableGetWeekResponse> run({
+    required String childId,
+    required DateTime from,
+    required DateTime until,
+  }) => getObject(
+    'timetable/child/${Uri.encodeComponent(childId)}',
+    TimetableGetWeekResponse.fromJson,
+    queryParameters: {'from': isoDate(from), 'until': isoDate(until)},
+  );
+}