improved timetable date range calculation to ensure the current week remains accessible during holiday gaps or when persisted bounds are stale, and updated holiday labels to prioritize long names over short names in the calendar view.

lib/view/pages/timetable/widgets/special_regions_builder.dart

@@ -83,7 +83,7 @@ class SpecialRegionsBuilder {
         final day = startDay.addDays(i);
         final key = _dayKey(day);
         byDay.putIfAbsent(key, () => _HolidayDay(day, [])).names.add(
-          holiday.shortName,
+          holiday.longName.isNotEmpty ? holiday.longName : holiday.shortName,
         );
       }
     }