feat(timezone): implement Tehran timezone handling across the application

assets/admin/pages/AppointmentCreatePage.tsx

@@ -12,6 +12,7 @@ import SearchableSelect from '../components/ui/SearchableSelect';
 import { WalletChargeLink } from '../components/AppointmentActions';
 import { useDoctorBookingServices } from '../hooks/useDoctorBookingServices';
 import ServiceSlotPicker from '../components/appointments/ServiceSlotPicker';
+import { tehranWallClockToUnix } from '../lib/utils';
 
 /**
  * افزودن نوبت — صفحهٔ کامل (بازسازی `CreateTurn.jsx` طرح tauri). از همان endpointهای
@@ -22,8 +23,7 @@ import ServiceSlotPicker from '../components/appointments/ServiceSlotPicker';
 interface Option { uuid: string; name?: string; full_name?: string }
 interface PatientRow { uuid: string; user_name?: string; user_mobile?: string; user_national_code?: string }
 
-const toEpoch = (isoDate: string, time: string) =>
-  Math.floor(new Date(`${isoDate}T${time || '00:00'}`).getTime() / 1000);
+const toEpoch = (isoDate: string, time: string) => tehranWallClockToUnix(isoDate, time);
 const addMinutes = (time: string, min: number) => {
   const [h, m] = time.split(':').map(Number);
   const t = h * 60 + m + min;

assets/admin/pages/AppointmentsPage.tsx

@@ -9,7 +9,7 @@ import { toast } from 'sonner';
 import { api } from '../lib/api';
 import type { PaginatedResponse, ApiResponse } from '../lib/api';
 import type { Appointment } from '../types';
-import { formatDate, toGregorianDate } from '../lib/utils';
+import { formatDate, toGregorianDate, formatTime } from '../lib/utils';
 import { useAuthStore } from '../stores/authStore';
 import Pagination from '../components/ui/Pagination';
 import AppointmentFiltersModal, { applyAppointmentFilters, EMPTY_FILTERS } from '../components/AppointmentFiltersModal';
@@ -432,7 +432,7 @@ export default function AppointmentsPage() {
     // حالت سرویسی: اسلات ثابت وجود ندارد — برای هر شیفتِ کاری، نوبت‌های رزروشده
     // نمایش داده می‌شوند و باقیِ زمان به‌صورت بازه‌(های) خالیِ قابل‌رزرو بین آن‌ها.
     if (serviceMode) {
-      const fmt = (ts: number) => new Date(ts * 1000).toLocaleTimeString('fa-IR', { hour: '2-digit', minute: '2-digit' });
+      const fmt = (ts: number) => formatTime(ts);
       const parseHM = (t: string) => { const [h, m] = (t ?? '00:00').split(':').map(Number); return (h * 3600) + (m * 60); };
       const rawSessions: any[] = (slotsQuery.data?.data as any)?.sessions ?? [];
       const booked = [...activeByStart.values()].sort((a, b) => Number(a.slot_start) - Number(b.slot_start));
@@ -479,8 +479,8 @@ export default function AppointmentsPage() {
         out.push({
           start: slotStart,
           end: slotEnd,
-          start_time: s.start_time ?? new Date(slotStart * 1000).toLocaleTimeString('fa-IR', { hour: '2-digit', minute: '2-digit' }),
-          end_time: s.end_time ?? new Date(slotEnd * 1000).toLocaleTimeString('fa-IR', { hour: '2-digit', minute: '2-digit' }),
+          start_time: s.start_time ?? formatTime(slotStart),
+          end_time: s.end_time ?? formatTime(slotEnd),
           is_available: s.is_available as boolean,
           appointment: activeByStart.get(slotStart) ?? null,
           cancelled_appointment: cancelledByStart.get(slotStart) ?? null,