fix(post form): block temporary media links

src/lib/utils/media-link-validation-utils.ts

@@ -0,0 +1,8 @@
+import { getExpiringMediaLinkHostname } from './url-utils';
+
+type TranslateFn = (key: string, options?: Record<string, unknown>) => string;
+
+export const getExpiringMediaLinkAlert = (url: string, t: TranslateFn): string | null => {
+  const expiringMediaLinkHostname = getExpiringMediaLinkHostname(url);
+  return expiringMediaLinkHostname ? `${t('error')}: ${t('expiring_media_link_alert', { domain: expiringMediaLinkHostname })}` : null;
+};