refactor:

www/src/lib/posts.ts

@@ -1,40 +0,0 @@
-import type { CollectionEntry } from 'astro:content';
-
-type Post = CollectionEntry<'md'>;
-
-export function getSlug(postId: string): string {
-  const parts = postId.split('/');
-  return parts[parts.length - 1];
-}
-
-export function sortPosts(posts: Post[]): Post[] {
-  return posts.slice().sort((a, b) => {
-    if (a.data.pinned && !b.data.pinned) return -1;
-    if (!a.data.pinned && b.data.pinned) return 1;
-    return b.data.date.getTime() - a.data.date.getTime();
-  });
-}
-
-export function organizePostsByCategory(posts: Post[]): {
-  grouped: Record<string, Post[]>;
-  categories: string[];
-} {
-  const grouped = posts.reduce((acc, post) => {
-    const category = post.data.category ?? 'md';
-    if (!acc[category]) acc[category] = [];
-    acc[category].push(post);
-    return acc;
-  }, {} as Record<string, Post[]>);
-
-  const categories = Object.keys(grouped).sort((a, b) => {
-    if (a === 'md') return -1;
-    if (b === 'md') return 1;
-    return a.localeCompare(b);
-  });
-
-  for (const category of categories) {
-    grouped[category] = sortPosts(grouped[category]);
-  }
-
-  return { grouped, categories };
-}