feat(chronicle): sort article list newest first

List now renders newest-to-oldest; item numbers stay in chronological
order to match the 第 N 篇 numbering on article pages.

src/pages/chronicle.astro

@@ -3,8 +3,8 @@ export const prerender = true;
 import { getCollection } from "astro:content";
 import { SITE } from "../site.config";
 
-// 班史列表：src/content/*.md（与首页「班级编年史」同源）
+// 班史列表：src/content/*.md
-// 升序排列，序号与文章页「第 N 篇」一致
+// 按时间倒序展示（最新在前）；序号仍是时间正序的第 N 篇，与文章页一致
 const posts = (await getCollection("chronicle")).sort(
     (a, b) => a.data.date.valueOf() - b.data.date.valueOf(),
 );
@@ -12,7 +12,8 @@ const posts = (await getCollection("chronicle")).sort(
 const pad = (n: number) => String(n).padStart(2, "0");
 const total = posts.length;
 
-const items = posts.map((post, i) => {
+const items = posts
+    .map((post, i) => {
         const d = post.data.date;
         return {
             index: i + 1,
@@ -22,7 +23,8 @@ const items = posts.map((post, i) => {
             author: post.data.author,
             url: `/pages/${post.id.split("/").pop()}`,
         };
-});
+    })
+    .reverse();
 ---
 
 <html lang="zh-CN">