feat(ui): update search component and improve responsive design

- Show only search icon on mobile (< 768px) in navbar
- Refactor Anchor component with better type safety and link handling
- Adjust spacing in Table of Contents and main content
- Improve responsive layout and consistency

app/docs/[[...slug]]/page.tsx

@@ -77,7 +77,7 @@ export default async function DocsPage({ params: { slug = [] } }: PageProps) {
 
   return (
     <div className="flex items-start gap-10">
-      <div className="flex-[4.5] pt-4 lg:pt-10">
+      <div className="flex-[4.5] pt-5">
         <MobToc tocs={tocs} />
         <DocsBreadcrumb paths={slug} />
         <Typography>