fix: enforce semantic contrast across admin

src/app/admin/help-questions/new/page.tsx

@@ -23,7 +23,7 @@ export default async function NewHelpQuestion({
         </div>
       </div>
       {error ? (
-        <p className="text-xs text-gray-500 dark:text-gray-400 mb-4" style={{ color: "#dc2626" }}>
+        <p className="text-xs theme-text-muted dark:theme-text-muted mb-4" style={{ color: "#dc2626" }}>
           Error: {error}
         </p>
       ) : null}