feat(admin): force Latin digits in numeric fields globally

- Add a numeric prop to the base Input component that sets inputMode,
  dir=ltr, lang=en and normalizes Persian/Arabic digits to Latin via the
  shared toEnglishDigits on every change.
- Dedupe digit conversion: PriceInput now uses toEnglishDigits instead of
  its local map; AppointmentsPage mobile handler uses sanitizeMobileInput.
- Fix raw national-code / mobile inputs in NewAppointmentModal and
  NewAppointmentDrawer that stripped Persian digits without converting.
- Cover the numeric Input behaviour with unit tests.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/admin/components/ui/PriceInput.tsx

@@ -1,4 +1,5 @@
 import React, { useEffect, useState } from 'react';
+import { toEnglishDigits } from '../../lib/utils';
 
 interface PriceInputProps {
   value: number | '';
@@ -10,17 +11,6 @@ interface PriceInputProps {
   min?: number;
 }
 
-const PERSIAN_TO_LATIN: Record<string, string> = {
-  '۰': '0', '۱': '1', '۲': '2', '۳': '3', '۴': '4',
-  '۵': '5', '۶': '6', '۷': '7', '۸': '8', '۹': '9',
-  '٠': '0', '١': '1', '٢': '2', '٣': '3', '٤': '4',
-  '٥': '5', '٦': '6', '٧': '7', '٨': '8', '٩': '9',
-};
-
-function toLatinDigits(str: string): string {
-  return str.replace(/[۰-۹٠-٩]/g, (ch) => PERSIAN_TO_LATIN[ch] ?? ch);
-}
-
 function formatDisplay(num: number): string {
   if (num === 0) return '';
   return new Intl.NumberFormat('fa-IR').format(num);
@@ -42,7 +32,7 @@ export default function PriceInput({
   }, [value]);
 
   const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
-    const raw = toLatinDigits(e.target.value).replace(/[^0-9]/g, '');
+    const raw = toEnglishDigits(e.target.value).replace(/[^0-9]/g, '');
     const num = raw === '' ? 0 : Math.max(min, parseInt(raw, 10));
     onChange(num);
     setDisplay(num > 0 ? formatDisplay(num) : '');