init repo

src/app/not-found.tsx

@@ -0,0 +1,15 @@
+"use client";
+
+import { Authenticated } from "@refinedev/core";
+import { ErrorComponent } from "@refinedev/mui";
+import { Suspense } from "react";
+
+export default function NotFound() {
+  return (
+    <Suspense>
+      <Authenticated key="not-found">
+        <ErrorComponent />
+      </Authenticated>
+    </Suspense>
+  );
+}