diff --git a/frontend/src/components/app-sidebar.tsx b/frontend/src/components/app-sidebar.tsx
index 3118201c..d4a15d2e 100644
--- a/frontend/src/components/app-sidebar.tsx
+++ b/frontend/src/components/app-sidebar.tsx
@@ -18,9 +18,10 @@ import {
   UserRound,
   Users,
 } from "lucide-react";
-import { usePathname, useRouter } from "next/navigation";
+import { usePathname } from "next/navigation";
 import { useEffect, useRef } from "react";
 import type { Ref } from "react";
+import { persistLoginSessionReturn } from "@/lib/chat-session-url";
 import {
   Sidebar,
   SidebarContent,
@@ -102,7 +103,7 @@ export function AppSidebar({
   sessionControls,
   onAccountMenuOpenChange,
   onNewChat,
-  onOpenReports,
+  onOpenReports: _onOpenReports,
   onSelectSession,
   onSelectChart,
   onAddChart,
@@ -113,7 +114,6 @@ export function AppSidebar({
   onOpenLogout,
 }: AppSidebarProps) {
   const { isMobile, setOpen, setOpenMobile, state, viewport } = useSidebar();
-  const router = useRouter();
   const pathname = usePathname();
   const firstSessionRef = useRef<HTMLButtonElement>(null);
   const historyHeadingRef = useRef<HTMLElement>(null);
@@ -149,18 +149,23 @@ export function AppSidebar({
     if (isMobile) setOpenMobile(false);
   }
 
+  function leaveChat(path: "/chart" | "/ephemeris" | "/reports") {
+    persistLoginSessionReturn();
+    window.location.assign(path);
+  }
+
   function handleOpenReports() {
-    onOpenReports();
+    leaveChat("/reports");
     if (isMobile) setOpenMobile(false);
   }
 
   function handleOpenChart() {
-    router.push("/chart");
+    leaveChat("/chart");
     if (isMobile) setOpenMobile(false);
   }
 
   function handleOpenEphemeris() {
-    router.push("/ephemeris");
+    leaveChat("/ephemeris");
     if (isMobile) setOpenMobile(false);
   }
 
diff --git a/frontend/tests/chat-navigation-a11y-contract.test.ts b/frontend/tests/chat-navigation-a11y-contract.test.ts
index f4e78b78..a49c9a2a 100644
--- a/frontend/tests/chat-navigation-a11y-contract.test.ts
+++ b/frontend/tests/chat-navigation-a11y-contract.test.ts
@@ -27,15 +27,15 @@ test("in-app destinations navigate client-side so the chat survives the round tr
   assert.match(pageSource, /const router = useRouter\(\)/);
 
   // 原值: 4 条 membershipHref 软跳 /membership
-  // 新值: 账单入口改 openAccountDialog("billing")；报告仍 router.push
-  // 原因: 删除 /membership 整页，对话状态不丢
+  // 新值: 账单入口改 openAccountDialog("billing")；离开对话的星盘/星历/报告走 document load
+  // 原因: 对话用 history.pushState 写 ?c=，App Router 的 router.push 无法离开首页
   assert.match(pageSource, /onOpenReports=\{\(\) => router\.push\("\/reports"\)\}/);
   assert.match(pageSource, /onOpenBilling=\{\(\) => openAccountDialog\("billing", \{ source: "account-menu" \}\)\}/);
   assert.match(pageSource, /openAccountDialog\("billing", \{ returnTarget: event\.currentTarget, source: "credits" \}\)/);
   assert.match(pageSource, /openAccountDialog\("billing", \{ source: "insufficient-credits" \}\)/);
   assert.match(pageSource, /if \(response\.status === 402\) openAccountDialog\("billing", \{ source: "insufficient-credits" \}\)/);
 
-  // And: none of them fall back to a document load.
+  // And: membership stays in-page; leaving chat uses a document load in the sidebar.
   assert.doesNotMatch(pageSource, /window\.location\.assign\("\/reports"\)/);
   assert.doesNotMatch(pageSource, /window\.location\.assign\(membershipHref\(/);
 });
diff --git a/frontend/tests/sidebar-contract.test.ts b/frontend/tests/sidebar-contract.test.ts
index 261de1da..adee2e65 100644
--- a/frontend/tests/sidebar-contract.test.ts
+++ b/frontend/tests/sidebar-contract.test.ts
@@ -185,6 +185,18 @@ test("keeps the sidebar brand row free of a duplicate collapse trigger", () => {
   assert.doesNotMatch(appSidebar, /SidebarTrigger/);
 });
 
+test("leaves the chat document for chart, ephemeris, and reports", () => {
+  const appSidebar = readProjectFile("src/components/app-sidebar.tsx");
+  // 对话首页用 history.pushState 维护 ?c=，App Router 的 router.push 无法离开。
+  assert.match(appSidebar, /persistLoginSessionReturn\(\);\s*window\.location\.assign\(path\)/);
+  assert.match(appSidebar, /leaveChat\("\/chart"\)/);
+  assert.match(appSidebar, /leaveChat\("\/ephemeris"\)/);
+  assert.match(appSidebar, /leaveChat\("\/reports"\)/);
+  assert.doesNotMatch(appSidebar, /router\.push\("\/chart"\)/);
+  assert.doesNotMatch(appSidebar, /router\.push\("\/ephemeris"\)/);
+  assert.doesNotMatch(appSidebar, /useRouter/);
+});
+
 test("uses one collapsed history action instead of icon-only session rows", () => {
   const appSidebar = readProjectFile("src/components/app-sidebar.tsx");
   assert.match(appSidebar, /MessageSquareText/);