added paginate

frontend/src/components/react/PostList.tsx

@@ -1,6 +1,8 @@
-import { useState } from 'react';
+import { useEffect, useRef, useState } from 'react';
 import { deletePost } from '../../lib/api';
 
+const PAGE_SIZE = 9;
+
 interface CoverImage {
   url: string;
   alt: string;
@@ -70,6 +72,8 @@ const LAYOUT_CYCLE: Array<{ col: number; aspect: string; tilt: number }> = [
 export default function PostList({ posts: initialPosts, isAdmin = false }: Props) {
   const [posts, setPosts] = useState(initialPosts);
   const [deleting, setDeleting] = useState<string | null>(null);
+  const [visible, setVisible] = useState(() => Math.min(PAGE_SIZE, initialPosts.length));
+  const sentinelRef = useRef<HTMLDivElement>(null);
 
   async function handleDelete(slug: string, title: string) {
     if (deleting) return;
@@ -85,13 +89,37 @@ export default function PostList({ posts: initialPosts, isAdmin = false }: Props
     }
   }
 
+  useEffect(() => {
+    setVisible(v => Math.min(Math.max(v, PAGE_SIZE), posts.length));
+  }, [posts.length]);
+
+  useEffect(() => {
+    if (visible >= posts.length) return;
+    const el = sentinelRef.current;
+    if (!el) return;
+    const io = new IntersectionObserver(
+      entries => {
+        if (entries.some(e => e.isIntersecting)) {
+          setVisible(v => Math.min(v + PAGE_SIZE, posts.length));
+        }
+      },
+      { rootMargin: '600px 0px' },
+    );
+    io.observe(el);
+    return () => io.disconnect();
+  }, [visible, posts.length]);
+
   if (posts.length === 0) {
     return null;
   }
 
+  const shown = posts.slice(0, visible);
+  const hasMore = visible < posts.length;
+
   return (
+    <>
     <div className="grid grid-cols-1 md:grid-cols-12 gap-8 md:gap-x-10 md:gap-y-16">
-      {posts.map((post, idx) => {
+      {shown.map((post, idx) => {
         const displayTitle = post.title || formatSlug(post.slug);
         const isDeleting = deleting === post.slug;
         const layout = LAYOUT_CYCLE[idx % LAYOUT_CYCLE.length];
@@ -205,5 +233,15 @@ export default function PostList({ posts: initialPosts, isAdmin = false }: Props
         );
       })}
     </div>
+    {hasMore && (
+      <div
+        ref={sentinelRef}
+        className="mt-12 md:mt-16 flex items-center justify-center text-[var(--subtext0)] font-display italic text-sm tracking-[0.2em] uppercase"
+        aria-hidden="true"
+      >
+        <span className="opacity-60">arranging more…</span>
+      </div>
+    )}
+    </>
   );
 }