fix unblocked slot showing as Ocupado instead of Disponible

GET /services/professional returns all statuses including cancelled.
After unblocking (self_booked → cancelled), _isOccupied matched the
cancelled service because it only excluded selfBooked.

Exclude cancelled and denied from _isOccupied so unblocked slots
correctly revert to Disponible.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/ui/views/professional_calendar_view.dart

@@ -404,7 +404,9 @@ class _ProfessionalCalendarViewState extends State<ProfessionalCalendarView> {
     return services.any((s) =>
         s.day == dayStr &&
         s.range1Hour1 == time &&
-        s.status != ServiceStatus.selfBooked);
+        s.status != ServiceStatus.selfBooked &&
+        s.status != ServiceStatus.cancelled &&
+        s.status != ServiceStatus.denied);
   }
 
   bool _isSelfBooked(TimeOfDay time, List<Service>? services, DateTime day) {