improvement: rtl direction, solar calendar and persian formatting added for persian users.

frontend/src/components/lab/caseDetailUtils.ts

@@ -1,5 +1,6 @@
 import type { LabCaseDetail } from '@/types/cases';
 import type { CaseToothChartProsthesisRow } from '@/components/ui/lab/CaseToothChartPanel';
+import { formatAppDateTime } from '@/lib/i18n/format';
 
 export function formatPatientName(patient: { firstName: string; lastName: string }) {
   return `${patient.firstName} ${patient.lastName}`.trim();
@@ -7,10 +8,7 @@ export function formatPatientName(patient: { firstName: string; lastName: string
 
 export function formatCaseDateTime(value: string | null, locale: string) {
   if (!value) return '—';
-  return new Intl.DateTimeFormat(locale, {
-    dateStyle: 'medium',
-    timeStyle: 'short',
-  }).format(new Date(value));
+  return formatAppDateTime(value, locale, { dateStyle: 'medium', timeStyle: 'short' });
 }
 
 export function buildCaseProsthesisRows(labCase: LabCaseDetail): CaseToothChartProsthesisRow[] {

frontend/src/components/lab/labCaseDueDateDisplay.ts

@@ -1,4 +1,5 @@
 import type { BadgeVariant } from '@/components/ui/shared/Badge';
+import { formatAppDate, APP_DATE } from '@/lib/i18n/format';
 
 export function toDateInputValue(iso: string | null | undefined): string {
   if (!iso) return '';
@@ -18,13 +19,7 @@ export function formatLabCaseDueDate(
   locale: string,
 ): string | null {
   if (!iso) return null;
-  const date = new Date(iso);
-  if (Number.isNaN(date.getTime())) return null;
-  return new Intl.DateTimeFormat(locale, {
-    year: 'numeric',
-    month: 'short',
-    day: 'numeric',
-  }).format(date);
+  return formatAppDate(iso, locale, APP_DATE.short);
 }
 
 /** Whole calendar days from today (UTC) until due date. Negative = overdue. */