refactor(home): 校正面 15 个状态从 Home 下沉

Home() useState 66->52, useRef 41->39. Shell-facing fields merge into one object;
subtree state lives in useRectificationSurface. Chat props 20->7. Growth contract
rebaselined. Zero behavior/copy change.

frontend/tests/consultation-entrypoint.test.ts

@@ -173,7 +173,10 @@ test("homepage birth-time card opens the V9 Agentic surface via the server case
   assert.match(source, /openRectificationFromHomepage/);
   assert.match(source, /<ConversationalBirthTimeRectification/);
   assert.match(component, /<RectificationAgenticChat \{\.\.\.props\} \/>/);
-  assert.match(source, /pendingConsultationQuestion=\{rectificationPendingQuestion\}/);
+  // 原值：pendingConsultationQuestion={rectificationPendingQuestion} 写在 page.tsx JSX
+  // 新值：pendingConsultationQuestion: rectificationPendingQuestion 写在 hook 的 panel
+  // 原因：校正面子树状态收到 panel，Home 不再逐个传
+  assert.match(source, /pendingConsultationQuestion: rectificationPendingQuestion/);
   assert.doesNotMatch(source, /chooseSuggestedQuestion\([\s\S]{0,180}"birth_time_rectification"/);
   assert.doesNotMatch(source, /draftBirthTimeRectificationQuestion/);
 });
@@ -203,7 +206,10 @@ test("homepage opens through the server Case API and merges the returned session
   assert.match(handler, /rectificationOpenInFlight\.current = true;[\s\S]*?finally \{[\s\S]*?rectificationOpenInFlight\.current = false;/);
   assert.doesNotMatch(handler, /onNarrativeDelta/);
   assert.match(source, /const rectificationSurfaceOpen = activeRectificationSession\s*&& activeSession\.id === rectificationSessionId/);
-  assert.match(source, /rectificationSurfaceOpen && rectificationCaseId && \([\s\S]*?<ConversationalBirthTimeRectification[\s\S]*?pendingConsultationQuestion=\{rectificationPendingQuestion\}/);
+  // 原值：同一守卫内 JSX 写 pendingConsultationQuestion={rectificationPendingQuestion}
+  // 新值：同一守卫内 JSX 写 panel={rectificationPanel}；pending 字段在 hook panel
+  // 原因：校正面子树状态收到 panel
+  assert.match(source, /rectificationSurfaceOpen && rectificationCaseId && \([\s\S]*?<ConversationalBirthTimeRectification[\s\S]*?panel=\{rectificationPanel\}/);
 });
 
 test("the page never creates the session shell locally; the server owns session creation", () => {
@@ -278,7 +284,10 @@ test("rectify-first handoffs stay as Agent context", () => {
   const source = homeSurface;
   const chat = readFileSync(new URL("../src/components/rectification-agentic-chat.tsx", import.meta.url), "utf8");
 
-  assert.match(source, /pendingConsultationQuestion=\{rectificationPendingQuestion\}/);
+  // 原值：pendingConsultationQuestion={rectificationPendingQuestion} 写在 page.tsx JSX
+  // 新值：pendingConsultationQuestion: rectificationPendingQuestion 写在 hook 的 panel
+  // 原因：校正面子树状态收到 panel，Home 不再逐个传
+  assert.match(source, /pendingConsultationQuestion: rectificationPendingQuestion/);
   assert.match(chat, /pendingConsultationQuestion\?\.trim\(\)/);
   // 旧 横幅承诺按钮会带回原问题 → 新 按钮已删，改成结束后新建对话再问 → 保留 pendingConsultationQuestion 传递链
   assert.match(chat, /结束后新建对话，按采用的时间再问/);
@@ -299,7 +308,10 @@ test("ordinary consultation uses current birth data without a rectification noti
 test("rectification mutations report pending state while session-level return controls stay absent", () => {
   const source = homeSurface;
 
-  assert.match(source, /onPendingChange=\{setRectificationMutationPending\}/);
+  // 原值：onPendingChange={setRectificationMutationPending} 写在 page.tsx JSX
+  // 新值：onPendingChange: setRectificationMutationPending 写在 hook 的 panel
+  // 原因：mutationPending 仍由外壳对象持有，但 setter 经 panel 交给子树
+  assert.match(source, /onPendingChange: setRectificationMutationPending/);
   assert.match(source, /disabled=\{productEntrypointsDisabled \|\| rectificationLoading \|\| rectificationMutationPending\}/);
   assert.doesNotMatch(source, /重试恢复/);
   assert.doesNotMatch(source, /返回并恢复原问题|返回首页/);

frontend/tests/home-shell-growth-contract.test.ts

@@ -4,15 +4,16 @@ import test from "node:test";
 
 const pageSource = readFileSync(new URL("../src/app/page.tsx", import.meta.url), "utf8");
 
-// Measured 2026-09-16 on origin/staging @ 51a65d92.
-// Line count: (pageSource.match(/\n/g) ?? []).length, same as `wc -l` = 1951.
+// Measured 2026-09-16 after home-state-lowering on origin/staging @ 3b17c1b2.
+// Line count: (pageSource.match(/\n/g) ?? []).length, same as `wc -l` = 1931.
 // Hook counts use \buseState[<(] / \buseRef[<(] so `useState<Type>(` is not missed.
-// Former line-count assertion lived in tests/chart-view-route.test.ts
-// (`page.tsx does not grow to host the chart page`).
-const PAGE_LINE_COUNT_BASELINE = 1951;
+// Former caps were useState 66 / useRef 41 / lines 1951 on freeze-metric @ 51a65d92.
+// This round moved 14 rectification useStates out of Home (15 → 1 shell object)
+// and 2 rectification refs into useRectificationSurface.
+const PAGE_LINE_COUNT_BASELINE = 1931;
 const PAGE_LINE_COUNT_CAP = PAGE_LINE_COUNT_BASELINE + 150;
-const HOME_USE_STATE_CAP = 66;
-const HOME_USE_REF_CAP = 41;
+const HOME_USE_STATE_CAP = 52;
+const HOME_USE_REF_CAP = 39;
 
 const USE_STATE_RE = /\buseState[<(]/g;
 const USE_REF_RE = /\buseRef[<(]/g;

frontend/tests/rectification-agentic-entry.test.ts

@@ -124,9 +124,15 @@ test("opening is server-owned: shouldStartOpening drives the first turn, never c
   // 新：增加 skip_probe（核对卡「这题跳过」）
   // 原因：决策 4，跳过只关本题
   assert.match(route, /action: z\.enum\(\["opening", "message", "read_only", "answer_choice", "stop_and_review", "skip_probe"\]\)/);
-  assert.match(page, /shouldStartOpening=\{rectificationShouldStartOpening\}/);
+  // 原值：shouldStartOpening={rectificationShouldStartOpening} 写在 page.tsx JSX
+  // 新值：shouldStartOpening: rectificationShouldStartOpening 写在 hook 的 panel
+  // 原因：开场开关只服务子树，随 panel 下沉
+  assert.match(page, /shouldStartOpening: rectificationShouldStartOpening/);
   assert.match(page, /setRectificationShouldStartOpening\(opened\.shouldStartOpening\)/);
-  assert.match(page, /onOpeningConsumed=\{\(\) => setRectificationShouldStartOpening\(false\)\}/);
+  // 原值：onOpeningConsumed={() => setRectificationShouldStartOpening(false)} 写在 page.tsx JSX
+  // 新值：onOpeningConsumed: () => setRectificationShouldStartOpening(false) 写在 hook 的 panel
+  // 原因：同上
+  assert.match(page, /onOpeningConsumed: \(\) => setRectificationShouldStartOpening\(false\)/);
 });
 
 test("incomplete profiles stay in the shared onboarding flow before any open request", () => {
@@ -221,9 +227,12 @@ test("persisted turns survive remounts; duplicate openings are suppressed by the
   // Was: the "ready"/"loading" key suffix (see above). Persisted turns now survive
   // because nothing remounts: the key is the session/Case binding only (BUG-505).
   assert.match(page, /key=\{`\$\{rectificationSessionId\}-\$\{rectificationCaseId\}`\}/);
-  assert.match(page, /initialTurns=\{rectificationTurns\}/);
-  assert.match(page, /onMessagesChange=\{handleRectificationMessagesChange\}/);
-  assert.match(page, /onOpeningConsumed=\{\(\) => setRectificationShouldStartOpening\(false\)\}/);
+  // 原值：initialTurns={rectificationTurns} / onMessagesChange={handleRectificationMessagesChange} / onOpeningConsumed={...} 写在 page.tsx JSX
+  // 新值：同名字段写在 hook 的 panel
+  // 原因：子树自有状态与回调收到 panel，Home 只传外壳还要读的绑定
+  assert.match(page, /initialTurns: rectificationTurns/);
+  assert.match(page, /onMessagesChange: handleRectificationMessagesChange/);
+  assert.match(page, /onOpeningConsumed: \(\) => setRectificationShouldStartOpening\(false\)/);
 });
 
 test("the agent route verifies the exact Case/Session binding before any turn", () => {
@@ -579,7 +588,10 @@ test("compact board overlays chat as a bottom sheet above the composer", () => {
   assert.match(page, /className="chat-header-rectification"/);
   assert.match(page, /data-rectification-header-slot=""/);
   assert.match(page, /ref=\{setRectificationHeaderSlot\}/);
-  assert.match(page, /headerSlot=\{rectificationHeaderSlot\}/);
+  // 原值：headerSlot={rectificationHeaderSlot} 写在 page.tsx JSX
+  // 新值：headerSlot: rectificationHeaderSlot 写在 hook 的 panel；page 仍 ref={setRectificationHeaderSlot}
+  // 原因：header 节点在外壳，值只服务子树
+  assert.match(page, /headerSlot: rectificationHeaderSlot/);
   assert.match(styles, /\.chat-header-rectification \.rectification-board-peek \{[\s\S]*width: auto/);
   assert.doesNotMatch(chat, /rectification-workspace__board-trigger/);
   assert.doesNotMatch(chat.slice(chat.indexOf("className=\"composer-wrap\""), chat.indexOf("<form className=\"composer\"")), /RectificationBoardPeek/);

frontend/tests/rectification-history-open-20260909.test.ts

@@ -46,7 +46,11 @@ test("a history-list open failure shows under the clicked row, not on the starte
   // 原值：rectificationError 只由 starter-home 画；selectSession 不切会话，表现为点了没反应
   // 新值：session 失败绑到被点的那一行；首页起始卡不重复同一条
   // 决策 3：错误就地显示
-  assert.match(pageSource, /const \[rectificationErrorSessionId, setRectificationErrorSessionId\]/);
+  // 原值：const [rectificationErrorSessionId, setRectificationErrorSessionId] = useState(...)
+  // 新值：外壳 9 个校正字段合成一个 rectification 对象；errorSessionId 仍叫 rectificationErrorSessionId，setter 仍叫 setRectificationErrorSessionId
+  // 原因：外壳也要读的校正状态合并成一个对象，散装 useState 下降
+  assert.match(pageSource, /errorSessionId: rectificationErrorSessionId,/);
+  assert.match(pageSource, /setRectificationErrorSessionId,/);
   assert.match(
     pageSource,
     /rectificationError=\{rectificationErrorSessionId \? "" : rectificationError\}/,

frontend/tests/rectification-surface-contract.test.ts

@@ -35,7 +35,10 @@ test("the rectification surface is revealed once: Case hydration precedes the sw
   // Panel: one key per binding, snapshot and turns as initial state, later turns as a prop update.
   assert.match(page, /key=\{`\$\{rectificationSessionId\}-\$\{rectificationCaseId\}`\}/);
   assert.doesNotMatch(page, /"ready" : "loading"/);
-  assert.match(page, /initialSnapshot=\{rectificationSnapshot\}/);
+  // 原值：initialSnapshot={rectificationSnapshot} 写在 page.tsx JSX
+  // 新值：initialSnapshot: rectificationSnapshot 写在 hook 的 panel
+  // 原因：snapshot 只服务子树，随 panel 下沉
+  assert.match(page, /initialSnapshot: rectificationSnapshot/);
   assert.match(page, /declaredTime=\{rectificationDeclaredTime\}/);
   assert.match(wrapper, /initialSnapshot: RectificationCaseSnapshotPayload \| null;/);
   assert.match(chat, /useState\(initialSnapshot !== null\)/);