fix turnstile

apps/web/src/components/contact/turnstile-widget.tsx

@@ -1,12 +1,19 @@
 'use client';
 import { Turnstile } from '@marsidev/react-turnstile';
 
+const SITE_KEY = process.env.NEXT_PUBLIC_TURNSTILE_SITE_KEY;
+
 export function TurnstileWidget({ onVerify }: { onVerify: (token: string) => void }) {
+  if (!SITE_KEY) {
+    console.warn('NEXT_PUBLIC_TURNSTILE_SITE_KEY is not set');
+    return null;
+  }
+
   return (
     <Turnstile
-      siteKey={process.env.NEXT_PUBLIC_TURNSTILE_SITE_KEY!}
+      siteKey={SITE_KEY}
       onSuccess={onVerify}
-      options={{ theme: 'auto' }} // Matches our Light/Dark mode!
+      options={{ theme: 'auto' }}
     />
   );
 }