Fix root cause: Remove duplicate RootProvider from docs layout

Co-authored-by: huangyiirene <7665279+huangyiirene@users.noreply.github.com>

Author: Copilot

apps/site/app/docs/layout.tsx

@@ -4,13 +4,7 @@ import { DocsLayout } from 'fumadocs-ui/layouts/docs';
 
 export default function Layout({ children }: { children: ReactNode }) {
   return (
-    <DocsLayout 
-      tree={source.pageTree} 
-      nav={{ title: 'Object UI' }}
-      sidebar={{
-        defaultOpenLevel: 1,
-      }}
-    >
+    <DocsLayout tree={source.pageTree} nav={{ title: 'Object UI' }}>
       {children}
     </DocsLayout>
   );

apps/site/app/global.css

@@ -1,10 +1,3 @@
 @tailwind base;
 @tailwind components;
 @tailwind utilities;
-
-/* Fix for docs sidebar height - ensure it extends to full viewport */
-aside[role="complementary"],
-[role="complementary"] {
-  inset-block-end: 0 !important;
-  height: 100vh !important;
-}