feat: add underline animation

- Implement underline-animation UnoCSS shortcut for navbar links
- Add dynamic hover and page transition effects for navigation
- Update Navbar component to use new underline-animation class
- Remove CDN configuration from preload settings
- Modify font class for date display in index page
- Add inline script to handle link animations during page transitions

src/pages/index.astro

@@ -39,7 +39,7 @@ const postsByYear = await getPostsByYear()
               {/* Post Title */}
               <a class="hover:text-secondary" href={`/posts/${post.data.slug || post.slug}`}>{post.data.title}</a>
                 {/* Post Date */} 
-                <div class="text-5.6 leading-7 font-date block lg:inline lg:before:content-['_']" aria-hidden="true">
+                <div class="text-5.6 leading-7 font-time block lg:inline lg:before:content-['_']" aria-hidden="true">
                   {post.data.published.toLocaleDateString('en-US', { month: '2-digit', day: '2-digit' }).replace('/', '-')}
                   {post.remarkPluginFrontmatter?.minutes &&  <span class="ml-2">  {post.remarkPluginFrontmatter.minutes} min</span>}
                 </div>