Remove unused import from beta-banner component

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

apps/site/components/beta-banner.tsx

@@ -1,5 +1,4 @@
 import Link from 'next/link';
-import { X } from 'lucide-react';
 
 export function BetaBanner() {
   return (