merge origin/staging into narrower delivery (只碰文档；显示漏段 BUG-1375 顺延为 BUG-1392, issue #77)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LutgzyJqNhPpZy1nFsJtN3

frontend/src/components/people/people-page.tsx

@@ -44,7 +44,7 @@ const DELETE_USAGE_UNAVAILABLE = "暂时查不到这个人的对话数量，稍
 /** `?person=new` marks the add form; a reload or Forward onto it shows the list. */
 const NEW_PERSON_PARAM = "new";
 
-const LIMIT_COPY = "最多保存 5 个人的星盘";
+const LIMIT_COPY = `最多保存 ${MAX_SAVED_SUBJECTS} 个人的星盘`;
 
 /** D1: below this width the page is list → detail; at and above it, two columns. */
 const PEOPLE_TWO_COLUMN_QUERY = "(min-width: 1024px)";

frontend/src/components/subject-switcher.tsx

@@ -11,6 +11,7 @@ import {
 } from "@/lib/chat-profile-picker-model";
 import { OrbitWaiting } from "@/components/orbit-waiting";
 import type { ChartLibraryRecord } from "@/lib/home-types";
+import { MAX_SAVED_SUBJECTS } from "@/lib/subject-birth";
 
 export type SubjectSwitcherProps = {
   readonly library: readonly ChartLibraryRecord[];
@@ -39,7 +40,7 @@ export function SubjectSwitcher({
   const [pendingId, setPendingId] = useState<string | null>(null);
   const triggerRef = useRef<HTMLButtonElement | null>(null);
   const listId = useId();
-  const rows = chatProfilePickerRows({ status, library, selectedId }).slice(0, 5);
+  const rows = chatProfilePickerRows({ status, library, selectedId }).slice(0, MAX_SAVED_SUBJECTS);
 
   function closePicker() {
     setOpen(false);