fix(web): 四个页面共用一份会话列表，空会话不入列

对话、星盘、星历、报告进同一 (app) 外壳，列表只拉一次。服务端不再列出空咨询；新建复用已有空会话。新标题改成「生时校正 · M月D日」，侧栏副标题用创建时间。

frontend/tests/chart-library-session.test.ts

@@ -6,7 +6,7 @@ import {
   chartLibraryOnCloudFailure,
   chartLibrarySessionBranch,
 } from "../src/lib/chart-library-session.ts";
-import { sessionSidebarSubtitle, sessionSidebarTitle } from "../src/lib/home-profile.ts";
+import { sessionSidebarSubtitle, sessionSidebarTitle, toSidebarSessionRow } from "../src/lib/session-sidebar-row.ts";
 import { emptyProfile, type ChartLibraryRecord, type ChatSession } from "../src/lib/home-types.ts";
 
 type RecordShape = { id: string; role: "self" | "other" };
@@ -57,6 +57,10 @@ test("a failed cloud read keeps only the profile-derived self chart", () => {
 });
 
 test("sidebar titles drop the chart-name prefix and only subtitle others", () => {
+  // 原值：本人盘副标题 null；他人盘只有资料名
+  // 新值：一律「M月D日 HH:MM」，他人盘再加「 · 盘主」
+  // 原因：任务书 T4 副标题规则
+  const createdAt = Date.parse("2026-09-14T04:14:00.000Z");
   const selfRecord: ChartLibraryRecord = {
     id: "self",
     role: "self",
@@ -71,7 +75,8 @@ test("sidebar titles drop the chart-name prefix and only subtitle others", () =>
     theme: "career",
     modelId: "m",
     messages: [],
-    updatedAt: 1,
+    createdAt,
+    updatedAt: createdAt,
     sessionType: "consultation",
     rectificationCaseId: null,
     chartProfileId: "self",
@@ -82,9 +87,9 @@ test("sidebar titles drop the chart-name prefix and only subtitle others", () =>
     messagesHydrated: true,
   };
   assert.equal(sessionSidebarTitle(base, library), "半年内换工作时机");
-  assert.equal(sessionSidebarSubtitle(base, library), null);
+  assert.equal(sessionSidebarSubtitle(base, library), "9月14日 12:14");
   const other = { ...base, chartProfileId: "other-1", chartProfileName: "对方", chartProfileRole: "other" as const };
-  assert.equal(sessionSidebarSubtitle(other, library), "资料已删除 · 对方");
+  assert.equal(sessionSidebarSubtitle(other, library), "9月14日 12:14 · 资料已删除 · 对方");
   const liveOtherLibrary: ChartLibraryRecord[] = [{
     ...selfRecord,
     id: "other-1",
@@ -92,5 +97,13 @@ test("sidebar titles drop the chart-name prefix and only subtitle others", () =>
     relationship: "partner",
     profile: { ...emptyProfile, name: "对方" },
   }];
-  assert.equal(sessionSidebarSubtitle(other, liveOtherLibrary), "对方");
+  assert.equal(sessionSidebarSubtitle(other, liveOtherLibrary), "9月14日 12:14 · 对方");
+  assert.deepEqual(toSidebarSessionRow(other, liveOtherLibrary), {
+    id: other.id,
+    title: "半年内换工作时机",
+    subtitle: "9月14日 12:14 · 对方",
+    pinned: false,
+    archived: false,
+    updatedAt: createdAt,
+  });
 });