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

assets/admin/components/AppointmentActions.tsx

@@ -20,7 +20,7 @@ import { useNavigate } from "react-router-dom";
 import { toast } from "sonner";
 import type { ApiResponse } from "../lib/api";
 import { api } from "../lib/api";
-import { formatRial } from "../lib/utils";
+import { formatRial, tehranWallClockToUnix } from "../lib/utils";
 import type { Appointment } from "../types";
 import AppointmentStatusDropdown from "./ui/AppointmentStatusDropdown";
 import Modal from "./ui/Modal";
@@ -30,8 +30,7 @@ import PriceInput from "./ui/PriceInput";
 /** Row actions for the appointments table (Figma عملیات menu). */
 type ModalKind = null | "info" | "move" | "transfer" | "replace";
 
-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);
 
 /**
  * Resolve the patient-record uuid behind an appointment via the patient list

assets/admin/components/NewAppointmentDrawer.tsx

@@ -8,12 +8,12 @@ import Modal from './ui/Modal';
 import PersianDateInput from './ui/PersianDateInput';
 import PriceInput from './ui/PriceInput';
 import { WalletChargeLink } from './AppointmentActions';
+import { tehranWallClockToUnix } from '../lib/utils';
 
 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/components/dashboard/NewAppointmentsTable.tsx

@@ -61,7 +61,7 @@ function StatusChip({ status }: { status: string }) {
 
 function formatTime(ts?: number | null): string {
   if (!ts) return '—';
-  return new Date(ts * 1000).toLocaleTimeString('fa-IR', { hour: '2-digit', minute: '2-digit' });
+  return new Intl.DateTimeFormat('fa-IR', { timeZone: 'Asia/Tehran', hour: '2-digit', minute: '2-digit' }).format(new Date(ts * 1000));
 }
 
 const HEAD = ['ردیف', 'نام بیمار', 'شماره تماس', 'شروع', 'پایان', 'سرویس', 'پرسنل', 'وضعیت', 'عملیات'];