Init

src/app/not-found.tsx

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+import Link from "next/link";
+import { Button } from "@/components/ui/button";
+
+export default function NotFound() {
+  return (
+    <div className="flex min-h-screen flex-col items-center justify-center gap-4">
+      <h1 className="text-4xl font-bold">404</h1>
+      <p className="text-muted-foreground">Page not found</p>
+      <Button asChild>
+        <Link href="/dashboard">Back to Dashboard</Link>
+      </Button>
+    </div>
+  );
+}