refactor: create highlight-footer for perfect alignment

- Rename highlight-meta to highlight-footer for semantic clarity
- Use flexbox with space-between for proper element spacing
- Ensure author name and menu button are perfectly vertically aligned
- Add min-height to author to match button height

src/components/HighlightItem.tsx

@@ -338,7 +338,7 @@ export const HighlightItem: React.FC<HighlightItemProps> = ({
         )}
         
         
-        <div className="highlight-meta">
+        <div className="highlight-footer">
           <span className="highlight-author">
             {getUserDisplayName()}
           </span>