Add aesthetic timeline to post lists

components/post-list-item.tsx

@@ -18,7 +18,8 @@ export function PostListItem({ post }: Props) {
     post.description || post.custom_excerpt || post.body?.raw?.slice(0, 120);
 
   return (
-    <li>
+    <li className="relative pl-6">
+      <span className="pointer-events-none absolute left-0 top-6 z-10 h-3 w-3 rounded-full border-2 border-white bg-gradient-to-br from-blue-500 via-sky-400 to-indigo-400 shadow-md dark:border-slate-900" aria-hidden="true" />
       <article className="motion-card group relative flex gap-4 rounded-lg border border-slate-200/70 bg-white/90 p-4 shadow-sm dark:border-slate-800 dark:bg-slate-900/80">
         <div className="pointer-events-none absolute inset-x-0 top-0 h-0.5 origin-left scale-x-0 bg-gradient-to-r from-blue-500 via-sky-400 to-indigo-500 opacity-80 transition-transform duration-300 ease-out group-hover:scale-x-100 dark:from-blue-400 dark:via-sky-300 dark:to-indigo-400" />
         {cover && (