refactor(layout): improve blog post layout and component styling

- Move AuthorCard to bottom of main content with enhanced styling
- Adjust TableOfContents styling and positioning
- Simplify AuthorCard and GlassHeader components

src/components/AuthorCard.tsx

@@ -20,7 +20,7 @@ export default function AuthorCard({ lang, author }: AuthorCardProps) {
   const websiteText = lang === 'zh' ? '个人网站' : 'Website';
 
   return (
-    <div className="bg-card/50 backdrop-blur-sm rounded-2xl border border-border p-6 relative">
+    <div className="relative">
       <div className="flex flex-col items-center text-center">
         {/* Avatar */}
         <div className="flex-shrink-0 mb-4">