feat(blog): improve blog overview teasers layout

Increases the line clamps for title and excerpt in the blog

overview grid. Also parses the markdown content to

auto-generate a fallback excerpt if omitted in frontmatter.

app/[locale]/blog/page.tsx

@@ -94,7 +94,7 @@ export default async function BlogIndex({ params }: BlogIndexProps) {
                   <Heading level={1} className="text-white mb-4 md:mb-8">
                     {featuredPost.frontmatter.title}
                   </Heading>
-                  <p className="text-base md:text-xl text-white/80 mb-6 md:mb-10 line-clamp-2 md:line-clamp-2 max-w-2xl">
+                  <p className="text-base md:text-xl text-white/80 mb-6 md:mb-10 line-clamp-3 md:line-clamp-4 max-w-2xl">
                     {featuredPost.frontmatter.excerpt}
                   </p>
                   <Button
@@ -197,10 +197,10 @@ export default async function BlogIndex({ params }: BlogIndexProps) {
                           </span>
                         )}
                       </div>
-                      <h3 className="text-lg md:text-2xl font-bold text-primary mb-3 md:mb-6 group-hover:text-accent-dark transition-colors line-clamp-2 leading-tight">
+                      <h3 className="text-lg md:text-2xl font-bold text-primary mb-3 md:mb-6 group-hover:text-accent-dark transition-colors line-clamp-3 md:line-clamp-4 leading-tight">
                         {post.frontmatter.title}
                       </h3>
-                      <p className="text-text-secondary text-sm md:text-lg line-clamp-2 md:line-clamp-3 mb-4 md:mb-8 leading-relaxed">
+                      <p className="text-text-secondary text-sm md:text-lg line-clamp-3 md:line-clamp-4 mb-4 md:mb-8 leading-relaxed">
                         {post.frontmatter.excerpt}
                       </p>
                       <div className="mt-auto pt-4 md:pt-8 border-t border-neutral-medium flex items-center justify-between">