Initial Commit

frontend/app/files/[token]/not-found.tsx

@@ -0,0 +1,14 @@
+import Link from "next/link";
+
+export default function NotFound() {
+  return (
+    <div className="flex min-h-[60vh] flex-col items-center justify-center px-6 text-center">
+      <p className="text-6xl">404</p>
+      <h1 className="mt-4 text-2xl font-bold text-white">File not found</h1>
+      <p className="mt-2 text-slate-400">This share link may have expired or never existed.</p>
+      <Link href="/browse" className="mt-6 text-sm text-cyan-400 hover:underline">
+        Browse all shared files →
+      </Link>
+    </div>
+  );
+}