Initial commit

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/components/not-found/go-back-button.tsx

@@ -0,0 +1,17 @@
+"use client";
+
+import { useRouter } from "next/navigation";
+
+export function GoBackButton({ className = "" }: { className?: string }) {
+  const router = useRouter();
+  const goBack = () => {
+    if (window.history.length > 1) router.back();
+    else router.push("/");
+  };
+
+  return (
+    <button type="button" onClick={goBack} className={`cursor-pointer ${className}`}>
+      返回上一页
+    </button>
+  );
+}