Initial project upload

frontend/app/not-found.tsx

@@ -0,0 +1,19 @@
+import Link from "next/link";
+import { Compass } from "lucide-react";
+
+export default function NotFound() {
+  return (
+    <div className="min-h-screen grid place-items-center p-8">
+      <div className="text-center max-w-md">
+        <div className="h-14 w-14 mx-auto rounded-full bg-blue-50 text-blue-500 grid place-items-center">
+          <Compass className="h-7 w-7" />
+        </div>
+        <h1 className="text-2xl font-extrabold mt-4">Page not found</h1>
+        <p className="text-slate-500 text-sm mt-2">The page you&apos;re looking for doesn&apos;t exist.</p>
+        <Link href="/" className="inline-block mt-6 bg-brand-600 text-white px-5 py-2 rounded-lg text-sm font-semibold">
+          Back home
+        </Link>
+      </div>
+    </div>
+  );
+}