First release.

src/components/article/CategorySummary.astro

@@ -0,0 +1,33 @@
+---
+import type { CollectionEntry, CollectionKey } from "astro:content";
+
+interface Props {
+  collectionName: CollectionKey;
+  categoryName: string;
+  posts: Array<CollectionEntry<CollectionKey>>;
+}
+const { collectionName, categoryName, posts } = Astro.props;
+---
+
+<h1>{categoryName}</h1>
+<ul>
+  {
+    posts.map((post) => (
+      <li>
+        <a href={`/article/${collectionName}/${post.slug}`} target="_blank">
+          {post.data.title}
+        </a>
+      </li>
+    ))
+  }
+</ul>
+
+<style>
+  ul {
+    padding: 0;
+    list-style-type: none;
+  }
+  h1 {
+    margin: 0.5em 0 0 0;
+  }
+</style>