fix(web): 会话列表合同跟着外壳搬家，无活跃会话不再静默吞发送

四条源码合同改到 (app)/layout 与注册载荷两端对断。列表只剩校正会话时普通输入框锁定，发送会打开校正或给出提示。

frontend/tests/chat-navigation-a11y-contract.test.ts

@@ -108,10 +108,16 @@ test("bootstrap failure retries with a hard reload because refresh cannot rerun
 });
 
 test("the streaming reply announces state transitions, never streamed deltas", () => {
-  // Given: one page-level status region outside every aria-busy subtree.
+  // 原值：page.tsx 里 `<main className="chat-app">` 紧跟 replyAnnouncement 的 sr-only 播报
+  // 新值：`<main className="chat-app">` 只在 (app)/layout.tsx 出现一次；播报仍在 page.tsx，是 SidebarInset 内容的第一个子节点
+  // 原因：T2 外壳搬家，播报仍在对话页、仍在 aria-busy 列表之外
+  const layout = readFileSync(new URL("../src/app/(app)/layout.tsx", import.meta.url), "utf8");
+  const pageFile = readFileSync(new URL("../src/app/(app)/page.tsx", import.meta.url), "utf8");
+  assert.equal(layout.match(/<main className="chat-app">/g)?.length, 1);
+  assert.doesNotMatch(pageFile, /<main className="chat-app">/);
   assert.match(
-    pageSource,
-    /<main className="chat-app">\n\s*<span className="sr-only" role="status" aria-live="polite" aria-atomic="true">\{replyAnnouncement\}<\/span>/,
+    pageFile,
+    /return \(\s*<>\s*<span className="sr-only" role="status" aria-live="polite" aria-atomic="true">\{replyAnnouncement\}<\/span>/,
   );
 
   // Then: the region is fed a phase-derived string, not the streaming text.

frontend/tests/chat-session-url.test.ts

@@ -213,12 +213,19 @@ test("home stays a client-read query on a static route", () => {
   assert.match(page, /window\.history\.replaceState/);
   assert.match(lib, /history\.pushState\(null, "", next\)/);
   assert.match(lib, /history\.replaceState\(null, "", next\)/);
+  // 原值：首页自己并发拉账户/目录/列表，`const [nextAccount, modelCatalogResult, sessionsPayload]`
+  // 新值：`await sessionListReady` 后读 `sessionListBoot()`，page.tsx 不再 `fetchSessions(`
+  // 原因：T2 列表由 layout provider 拉一次；本条仍守「`/` 是静态路由上的客户端读」
+  const pageFile = readFileSync(new URL("../src/app/(app)/page.tsx", import.meta.url), "utf8");
   const preview = sourceBetween(
-    page,
+    pageFile,
     "if (previewMode) {",
-    "const [nextAccount, modelCatalogResult, sessionsPayload]",
+    "await sessionListReady;",
   );
   assert.doesNotMatch(preview, /writeSessionUrl|persistLoginSessionReturn|readLoginSessionReturn/);
+  assert.match(pageFile, /await sessionListReady;/);
+  assert.match(pageFile, /sessionListBoot\(\)/);
+  assert.doesNotMatch(pageFile, /fetchSessions\(/);
   assert.match(page, /SESSION_MISSING_NOTICE/);
   assert.equal(SESSION_MISSING_NOTICE, "该对话不存在或已被删除");
 });

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

@@ -55,11 +55,15 @@ test("a history-list open failure shows under the clicked row, not on the starte
     pageSource,
     /rectificationError=\{rectificationErrorSessionId \? "" : rectificationError\}/,
   );
-  assert.match(pageSource, /openErrorSessionId=\{rectificationErrorSessionId\}/);
-  assert.match(
-    pageSource,
-    /openErrorMessage=\{rectificationErrorSessionId \? rectificationErrorMessage : ""\}/,
-  );
+  // 原值：page.tsx 把 openErrorSessionId / openErrorMessage 直接传给 AppSidebar
+  // 新值：layout 从 registration 传给 AppSidebar，首页 registerShellControls 载荷带这两个字段
+  // 原因：T2 外壳搬家，两端都断才等于侧栏行仍拿得到打开失败
+  const layout = read("../src/app/(app)/layout.tsx");
+  const shell = read("../src/hooks/use-home-shell-registration.ts");
+  assert.match(layout, /openErrorSessionId=\{registration\?\.openErrorSessionId \?\? null\}/);
+  assert.match(layout, /openErrorMessage=\{registration\?\.openErrorMessage \?\? ""\}/);
+  assert.match(shell, /openErrorSessionId: rectificationErrorSessionId,/);
+  assert.match(shell, /openErrorMessage: rectificationErrorSessionId \? rectificationErrorMessage : "",/);
   assert.match(starter, /rectificationError && !rectificationSurfaceOpen && \(/);
   assert.match(sidebar, /openErrorSessionId/);
   assert.match(sidebarRow, /error \? \(/);
@@ -70,5 +74,5 @@ test("a history-list open failure shows under the clicked row, not on the starte
   const notice = cssDeclarations(".session-open-error", styles);
   assert.match(notice, /color:\s*var\(--color-danger\)/);
   assert.match(notice, /font-size:\s*var\(--type-overline\)/);
-  assert.match(page, /openErrorSessionId=\{rectificationErrorSessionId\}/);
+  assert.match(layout, /openErrorSessionId=\{registration\?\.openErrorSessionId \?\? null\}/);
 });

frontend/tests/rectification-session-composer-guard.test.ts

@@ -4,9 +4,11 @@ import test from "node:test";
 
 import { homeSurface as page } from "./home-surface.ts";
 import {
+  composerLocksAsRectification,
   consultSendBlockedByRectificationSession,
   dropRectificationStoredPending,
   fallbackSessionId,
+  missingActiveSessionSendAction,
   RECTIFICATION_OPENING_COMPOSER_PLACEHOLDER,
   RECTIFICATION_REOPEN_LABEL,
   rectificationOrdinaryComposerReopen,
@@ -104,3 +106,34 @@ test("delete and popstate fallbacks do not setActiveSessionId onto a rectificati
   assert.match(sessions, /const fallbackId = fallbackSessionId\(listed\);/);
   assert.match(page, /sessions.find\(\(session\) => session.sessionType !== "birth_time_rectification"\)/);
 });
+
+test("an empty active session still locks the composer when the list is only rectification", () => {
+  assert.equal(
+    composerLocksAsRectification(undefined, [{ sessionType: "birth_time_rectification" }]),
+    true,
+  );
+  assert.equal(
+    composerLocksAsRectification(undefined, [{ sessionType: "consultation" }]),
+    false,
+  );
+  assert.equal(
+    composerLocksAsRectification({ sessionType: "consultation" }, [{ sessionType: "birth_time_rectification" }]),
+    false,
+  );
+  assert.deepEqual(
+    missingActiveSessionSendAction([{ id: "r1", sessionType: "birth_time_rectification" }]),
+    { openSessionId: "r1" },
+  );
+  assert.deepEqual(
+    missingActiveSessionSendAction([]),
+    { notice: "请先选一条对话，或点上方「新建对话」。" },
+  );
+  assert.match(pageSource, /composerLocksAsRectification\(activeSession, sessions\)/);
+  assert.match(sendFn, /missingActiveSessionSendAction\(sessions\)/);
+  assert.match(sendFn, /openRectificationSession\(action\.openSessionId\)/);
+  assert.match(sendFn, /setComposerNotice\(action\.notice\)/);
+  assert.doesNotMatch(
+    sendFn,
+    /if \(!question \|\| !currentSession \|\| !modelCatalog \|\| !account\) return false;/,
+  );
+});

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

@@ -82,7 +82,13 @@ test("entry feedback is static: card and sidebar row say 正在打开, and nothi
   assert.doesNotMatch(starter, /InlineSpinner/);
   assert.match(sidebarRow, /aria-busy=\{opening \? true : undefined\}/);
   assert.match(sidebarRow, /RECTIFICATION_SIDEBAR_OPENING_NOTE/);
-  assert.match(page, /openingSessionId=\{rectificationOpeningSessionId\}/);
+  // 原值：page.tsx 把 openingSessionId 直接传给 AppSidebar
+  // 新值：layout 从 registration 传入，首页 registerShellControls 载荷带 openingSessionId
+  // 原因：T2 外壳搬家，两端都断才等于侧栏行仍拿得到正在打开
+  const layout = read("../src/app/(app)/layout.tsx");
+  const shell = read("../src/hooks/use-home-shell-registration.ts");
+  assert.match(layout, /openingSessionId=\{registration\?\.openingSessionId \?\? null\}/);
+  assert.match(shell, /openingSessionId: rectificationOpeningSessionId,/);
   // 原值 `.product-entrypoint-card[data-opening="true"]` / 新值 `.starter-entry[data-opening="true"]`
   // / 原因：入口从卡片降级成 pill。「打开 Case 时只换指针、不出 spinner」这条不变。
   assert.match(styles, /\.starter-entry\[data-opening="true"\][^{]*\{ cursor: progress; \}/);