chore: import upstream snapshot with attribution

apps/docs/components/fixed-feature-overview/index.less

@@ -0,0 +1,21 @@
+/**
+ * Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+ * SPDX-License-Identifier: MIT
+ */
+
+.doc-feature-overview {
+  position: relative;
+  z-index: 1;
+
+  .gedit-playground {
+    position: relative;
+    width: 100%;
+    height: 600px;
+  }
+
+  .fixed-demo-tools {
+    position: relative;
+    bottom: 40px;
+    color: black;
+  }
+}

apps/docs/components/fixed-feature-overview/index.tsx

@@ -0,0 +1,17 @@
+/**
+ * Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+ * SPDX-License-Identifier: MIT
+ */
+
+import React from 'react';
+
+import './index.less';
+
+// https://github.com/web-infra-dev/rspress/issues/553
+const FixedFeatureOverview = React.lazy(() =>
+  import('@flowgram.ai/demo-fixed-layout').then((module) => ({
+    default: module.DemoFixedLayout,
+  }))
+);
+
+export { FixedFeatureOverview };