isIslamicHoliday static method
Checks if a date is an Islamic holiday (Eid)
Implementation
static bool isIslamicHoliday(HijriDate date) {
final events = getEventsForDate(date);
return events.any((event) =>
event.type == IslamicEventType.eidAlFitr ||
event.type == IslamicEventType.eidAlAdha);
}