added guardian login with views for their assigned childs

lib/state/app/modules/timetable/bloc/timetable_state.dart

@@ -40,9 +40,12 @@ abstract class TimetableState with _$TimetableState {
   Iterable<McTimetableEntry> getAllKnownLessons() =>
       weekCache.values.expand((response) => response.entries);
 
-  bool get hasReferenceData =>
+  /// Whether the calendar has everything it needs to render. Custom events
+  /// only exist for subjects that support them; requiring them elsewhere would
+  /// keep foreign plans loading forever.
+  bool isReady({required bool needsCustomEvents}) =>
       rooms != null &&
       subjects != null &&
       schoolHolidays != null &&
-      customEvents != null;
+      (!needsCustomEvents || customEvents != null);
 }