Add Persian date input and refine admin category/check screens.

Introduce shared PersianDateInput with jalali utilities and align categories and check management views with updated form patterns.

src/views/checks/CheckManagementView.vue

@@ -4,7 +4,7 @@ import { useRoute, useRouter } from 'vue-router'
 import StatusBadge from '@/components/ui/StatusBadge.vue'
 import { checksApi, mapAdminOrder, ordersApi, type ApiOrder } from '@/services/api'
 import { ApiError } from '@/services/http'
-import { formatCurrency, formatDate } from '@/utils/format'
+import { formatCurrency, formatDate, formatDateTime as formatPersianDateTime } from '@/utils/format'
 import { useToast } from '@/composables/useToast'
 import { confirm } from '@/composables/useConfirm'
 import { rawStatusLabel } from '@/utils/orderStatus'
@@ -118,15 +118,7 @@ function actorLabel(changedBy?: string) {
 }
 
 function formatDateTime(iso?: string) {
-  if (!iso) return '—'
-  try {
-    return new Intl.DateTimeFormat('fa-IR', {
-      dateStyle: 'medium',
-      timeStyle: 'short',
-    }).format(new Date(iso))
-  } catch {
-    return iso.slice(0, 16).replace('T', ' ')
-  }
+  return formatPersianDateTime(iso)
 }
 
 function ownerName(check: Check) {