fix: SearchableSelect matches value across string/number types

Insurance option values are strings (String(insurance_id)) while the patient
profile prefill is a number, so strict === matching left بیمه پایه/تکمیلی
showing the placeholder on load — the saved insurance was invisible and looked
unsaved even though PATCH persisted it. Match with String(o.value) ===
String(value) so numeric prefills bind to string-valued options (and vice
versa); null/'' still selects nothing. Verified live: selects now display the
saved insurance after reload.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

assets/admin/components/ui/SearchableSelect.tsx

@@ -34,8 +34,12 @@ export default function SearchableSelect({
 }: Props) {
   const darkMode = useUiStore((s) => s.darkMode);
 
+  // مقایسهٔ نرم (string↔number): مقدار پیش‌فرض ممکن است number باشد ولی value گزینه String
+  // (مثلاً id بیمه). تطبیق سخت‌گیرانه در این حالت گزینه را خالی نشان می‌داد.
   const selected = useMemo(
-    () => options.find((o) => o.value === value) ?? null,
+    () => (value == null || value === ''
+      ? null
+      : options.find((o) => String(o.value) === String(value)) ?? null),
     [options, value],
   );