Home first screen no longer carries the rectification surface or react-markdown (issue #124, BUG-1474)

page.tsx imported the whole rectification surface statically; its verification
report also imported chat-markdown-view statically, which pulled react-markdown
into / even though chat-message-content already loaded it lazily.

- Home renders a same-named lazy wrapper; openRectificationCase starts the
  download with the open request and awaits it before setting the ids that
  mount the surface, so it still reveals once, drawn.
- The markdown loader moves to lib/chat-markdown-loader; the home bootstrap
  awaits it before revealing a conversation with messages (no plain-text flash
  on ?c=). The blank home does not wait.

/ first load, gzip-9 of every referenced JS/CSS: 704,165 -> 609,606 B (-13.4%),
still Static.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/testing/code-health-118-20261028.md

@@ -23,3 +23,9 @@
 11. 电脑打开首页、右侧本命盘开着，问一个会写长回答的问题：回答照常逐字出来，右侧盘不闪、不跳；出字过程中拖动右侧盘的宽度、点盘上的宫位都跟手。
 12. 回答还没出字时点「停止」：提示是「停止回答并申请退回本次点数」；出了一些字以后再问一次并点停止：提示变成「停止回答，保留已生成内容并退回本次点数」。
 
+## #124 首页少下载校正界面和排版组件（BUG-1474）
+
+13. 清掉浏览器缓存后打开首页：问候和输入框照常一次出来；问一个问题，回答里的加粗、列表照常有格式。
+14. 侧栏点一条以前的长对话（或直接打开带 `?c=` 的对话链接）：一出现就是排好版的样子，不先闪一下纯文本。
+15. 从首页进入生时校正（说「帮我做生时纠正」，或从星盘页进入）：校正界面一次出现，题目和进度都在，没有空白、没有转圈。
+