improvement: some improvement done for appointment and treatment shared components.

frontend/src/components/ui/appointments/AppointmentBookingModal.tsx

@@ -203,13 +203,16 @@ export function AppointmentBookingModal({
     }
 
     const now = new Date();
-    if (isSameLocalCalendarDay(scheduleDate, now) && startAt.getTime() < now.getTime()) {
+    if (
+      !editingAppointment &&
+      isSameLocalCalendarDay(scheduleDate, now) &&
+      startAt.getTime() < now.getTime()
+    ) {
       setError(t('errorPastSchedule'));
       return;
     }
 
-    const today = new Date();
-    if (compareLocalDayStart(scheduleDate, today) < 0) {
+    if (!editingAppointment && compareLocalDayStart(scheduleDate, now) < 0) {
       setError(t('errorPastViewOnly'));
       return;
     }