feat: add doctor invitation modal and appointment creation API

- Implemented InviteDoctorModal component for inviting doctors to clinics.
- Updated ClinicDashboard to include a button for inviting doctors and handle modal state.
- Added createAppointment API endpoint in AdminApiController for scheduling appointments.
- Enhanced ClinicInvitationController to check user access when inviting doctors.
- Updated MyAppointmentsController to ensure unique appointment records.
- Added seed_test_data.php for populating test data including doctors, clinics, and appointments.
- Refactored styles to include new appointment status badges and updated font imports.

assets/admin/lib/utils.ts

@@ -6,32 +6,36 @@ export function formatNumber(n: number): string {
   return new Intl.NumberFormat('fa-IR').format(n);
 }
 
-export function formatDate(dateStr: string | null | undefined): string {
-  if (!dateStr) return '—';
-  try {
-    return new Intl.DateTimeFormat('fa-IR', {
-      year: 'numeric',
-      month: '2-digit',
-      day: '2-digit',
-    }).format(new Date(dateStr));
-  } catch {
-    return dateStr;
-  }
+export function toDate(val: string | number | null | undefined): Date | null {
+  if (val == null || val === '') return null;
+  if (typeof val === 'number') return new Date(val * 1000);
+  // Y-m-d → treat as local noon to avoid UTC-off-by-one
+  if (/^\d{4}-\d{2}-\d{2}$/.test(val)) return new Date(`${val}T12:00:00`);
+  return new Date(val);
 }
 
-export function formatDateTime(dateStr: string | null | undefined): string {
-  if (!dateStr) return '—';
-  try {
-    return new Intl.DateTimeFormat('fa-IR', {
-      year: 'numeric',
-      month: '2-digit',
-      day: '2-digit',
-      hour: '2-digit',
-      minute: '2-digit',
-    }).format(new Date(dateStr));
-  } catch {
-    return dateStr;
-  }
+export function formatDate(val: string | number | null | undefined): string {
+  const d = toDate(val);
+  if (!d || isNaN(d.getTime())) return '—';
+  return new Intl.DateTimeFormat('fa-IR-u-ca-persian', {
+    year: 'numeric', month: '2-digit', day: '2-digit',
+  }).format(d);
+}
+
+export function formatDateTime(val: string | number | null | undefined): string {
+  const d = toDate(val);
+  if (!d || isNaN(d.getTime())) return '—';
+  return new Intl.DateTimeFormat('fa-IR-u-ca-persian', {
+    year: 'numeric', month: '2-digit', day: '2-digit',
+    hour: '2-digit', minute: '2-digit',
+  }).format(d);
+}
+
+export function toGregorianDate(d: Date): string {
+  const y = d.getFullYear();
+  const m = String(d.getMonth() + 1).padStart(2, '0');
+  const day = String(d.getDate()).padStart(2, '0');
+  return `${y}-${m}-${day}`;
 }
 
 export function maskMobile(mobile: string): string {