Fix docs sidebar height issue with CSS override

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

Author: Copilot

apps/site/app/docs/layout.tsx

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

apps/site/app/global.css

@@ -1,3 +1,10 @@
 @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;
+}