fix: close the window from the last conversation tab

.agents/docs/sessions-tabs-routing.md

@@ -35,7 +35,9 @@ this page is the full text of the rules summarised there.
     A lone parent Session tab is not draggable; enable tab drag only once a
     second visible tab exists. On desktop, Cmd/Ctrl+W is the native Close
     accelerator. Session-detail registers a tab closer: focused side panel or
-    conversation tab closes, including the parent. Close writes shared `isTabClosed`,
+    conversation tab closes, including the parent when siblings remain. With only
+    one conversation tab, the conversation region yields to window close without
+    changing shared tab state. Explicit tab × still closes the tab. Tab close writes shared `isTabClosed`,
     selects the next open neighbour (right then left), or enters a local draft.
     `?tab=empty` remains an entry sentinel: after hydration, reuse a local draft or
     create one and replace the URL. Mobile viewers remain active. With

.agents/notes/implemented/bug-fix/2026-09-21-last-tab-window-close.md

@@ -0,0 +1,35 @@
+# Close the window from the last conversation tab
+
+Status: implemented
+Translation: current
+PR: [#866](https://github.com/LodyAI/Lody/pull/866)
+
+English | [中文](2026-09-21-last-tab-window-close.zh.md)
+
+## Abstract
+
+Cmd/Ctrl+W closed the sole conversation tab in a newly opened Session window,
+leaving a draft instead of closing the window. The close resolver now yields to
+native window close when one conversation tab remains, including a child or draft.
+Focused side-panel tabs retain priority, and explicit tab × keeps its existing
+lifecycle behavior. The same rule applies to primary and auxiliary windows.
+
+## Decision and evidence
+
+The resolver accepted but ignored the visible conversation count. It now returns
+an explicit window target, which SessionDetail forwards to the existing shell
+close fallback without calling the shared tab mutation. This avoids special-casing
+window origin and preserves native main-window hide versus auxiliary-window close.
+Multiple conversation tabs still close individually.
+
+This changes only shortcut routing; the [empty-tab deletion decision](2026-09-18-empty-tab-close-exact-delete.md)
+still governs explicit tab closure. Intent: [desktop windows](../../../../specs/desktop-windows.md).
+Regression cases in [the owning suite](../../../../packages/components/tests/session-tab-close-target.test.ts)
+cover parent, child, draft, focused/hidden side panel, multiple tabs, and empty surfaces.
+
+## Verification limits
+
+Oxfmt passes for the three changed TypeScript files. The checkout has no installed
+dependencies: `pnpm check`, `pnpm format`, and targeted Vitest are blocked by missing
+tsgo, oxfmt, and vitest respectively. Documentation checks retain existing submodule
+link failures. Native Electron interaction has not been exercised in this checkout.

.agents/notes/implemented/bug-fix/2026-09-21-last-tab-window-close.zh.md

@@ -0,0 +1,31 @@
+# 最后一个对话标签的快捷键关闭窗口
+
+Status: implemented
+Translation: current
+PR: [#866](https://github.com/LodyAI/Lody/pull/866)
+
+[English](2026-09-21-last-tab-window-close.md) | 中文
+
+## 摘要
+
+新开的会话窗口只有一个对话标签时，Cmd/Ctrl+W 原先关闭标签并留下草稿，而没有关闭窗口。
+关闭目标解析现在在仅剩一个对话标签时交给原生窗口关闭，子会话和草稿同样适用。
+有焦点的侧面板标签仍优先关闭，显式点击标签 × 保持既有生命周期行为。
+主窗口和辅助窗口采用同一规则。
+
+## 决策与证据
+
+解析函数原先接收却忽略可见对话数量。现在返回明确的窗口目标，SessionDetail 将其交给
+已有的窗口关闭回退路径，不执行共享标签状态变更。无需按窗口来源添加分支，也保留了
+主窗口隐藏和辅助窗口关闭的原生区别。多个对话标签仍逐个关闭。
+
+此次只修改快捷键路由；[空标签删除决策](2026-09-18-empty-tab-close-exact-delete.zh.md)
+仍约束显式标签关闭。产品意图见[桌面多窗口](../../../../specs/desktop-windows.zh.md)。
+[既有测试套件](../../../../packages/components/tests/session-tab-close-target.test.ts)
+覆盖父会话、子会话、草稿、聚焦及隐藏的侧面板、多标签和空页面。
+
+## 验证限制
+
+改动的三个 TypeScript 文件通过 Oxfmt 格式检查。当前检出没有安装依赖，
+`pnpm check`、`pnpm format` 和定向 Vitest 分别被缺少 tsgo、oxfmt、vitest 阻断。
+文档检查仍有既有子模块断链。本次未在原生 Electron 窗口中执行交互验证。

packages/components/src/components/sessions/AGENTS.md

@@ -1,9 +1,8 @@
 # components/sessions
 
-`CLAUDE.md` is a symlink to this file. Edit `AGENTS.md` only.
+`CLAUDE.md` symlinks here. Edit `AGENTS.md` only.
 
-Parent AGENTS apply. Files: [README.md](README.md); data: `context/message-flow.md`.
-Read each heading’s linked context before changing its files.
+Parent rules apply. Read each heading’s linked context before edits.
 
 ## [Tabs and `?tab` routing](../../../../../.agents/docs/sessions-tabs-routing.md)
 
@@ -17,6 +16,7 @@ Read each heading’s linked context before changing its files.
   may replace the current choice with a neighbour or local draft. Close writes
   `isTabClosed`, never archive — a never-messaged tab is exact-deleted.
   Reopening archives restores lifecycle first.
+- Cmd/Ctrl+W: lone conversation closes window; focused side-panel tab closes first.
 - `Change owner` writes the OWNER `SessionMeta.userId`, never sharing/visibility;
   they stay separate actions.
 

packages/components/src/components/sessions/README.md

@@ -20,7 +20,7 @@ describes the shared parsing and persistence boundary.
 | `session-tab-bar.tsx`                        | Desktop merged top row: session tab pills, status slot, drag sources        |
 | `adaptive-tab-strip.tsx`                     | Width sharing for the tab pills                                             |
 | `session-side-panel-tab-bar.tsx`             | Right-panel tab strip (fixed panels, side chats, viewers)                   |
-| `session-tab-close-target.ts`                | Registration for the Cmd/Ctrl+W close target                                |
+| `session-tab-close-target.ts`                | Resolve the focused tab or last-tab window close target                                |
 | `session-list-rows.ts`                       | Sidebar/tab row derivation, including child grouping by parent              |
 | `child-tab-empty-state.tsx`                  | Suggestions shown in an empty child tab                                     |
 | `session-not-found.tsx`                      | Missing-session surface                                                     |

packages/components/src/components/sessions/session-detail.tsx

@@ -4442,7 +4442,7 @@ const SessionDetail = ({
     () => {
       const target = resolveFocusedTabCloseTarget();
       if (!target) return 'handled';
-      if (target.kind === 'landing') {
+      if (target.kind === 'window') {
         return 'unhandled';
       }
       if (target.kind === 'side-panel') {

packages/components/src/components/sessions/session-tab-close-target.ts

@@ -5,13 +5,14 @@ export type SessionTabFocusRegion = 'conversation' | 'side-panel';
 export type SessionTabCloseTarget =
   | { kind: 'conversation'; tabId: string }
   | { kind: 'side-panel'; tabId: string }
-  | { kind: 'landing' };
+  | { kind: 'window' };
 
 export function getSessionTabCloseTarget({
   focusRegion,
   sidePanelOpen,
   activeSidePanelTabId,
   activeConversationTabId,
+  conversationTabCount,
 }: {
   focusRegion: SessionTabFocusRegion;
   sidePanelOpen: boolean;
@@ -22,13 +23,14 @@ export function getSessionTabCloseTarget({
 }): SessionTabCloseTarget | null {
   if (focusRegion === 'side-panel' && sidePanelOpen) {
     if (activeSidePanelTabId) return { kind: 'side-panel', tabId: activeSidePanelTabId };
-    return activeConversationTabId === EMPTY_SESSION_TAB_ID ? { kind: 'landing' } : null;
+    return activeConversationTabId === EMPTY_SESSION_TAB_ID ? { kind: 'window' } : null;
   }
   if (activeConversationTabId !== EMPTY_SESSION_TAB_ID) {
+    if (conversationTabCount === 1) return { kind: 'window' };
     return { kind: 'conversation', tabId: activeConversationTabId };
   }
   if (sidePanelOpen && activeSidePanelTabId) {
     return { kind: 'side-panel', tabId: activeSidePanelTabId };
   }
-  return { kind: 'landing' };
+  return { kind: 'window' };
 }

packages/components/tests/session-tab-close-target.test.ts

@@ -56,15 +56,40 @@ describe('getSessionTabCloseTarget', () => {
     ).toEqual({ kind: 'conversation', tabId: 'parent-session' });
   });
 
-  it('closes the last parent tab before closing the window', () => {
+  it.each(['parent-session', 'child-session', 'draft:local'])(
+    'closes the window for the last conversation tab (%s)',
+    (activeConversationTabId) => {
+      expect(
+        getSessionTabCloseTarget({
+          ...BASE_INPUT,
+          activeConversationTabId,
+          conversationTabCount: 1,
+        })
+      ).toEqual({ kind: 'window' });
+    }
+  );
+
+  it('keeps side-panel close priority with only one conversation tab', () => {
     expect(
       getSessionTabCloseTarget({
         ...BASE_INPUT,
-        activeConversationTabId: 'parent-session',
+        focusRegion: 'side-panel',
         conversationTabCount: 1,
       })
-    ).toEqual({ kind: 'conversation', tabId: 'parent-session' });
+    ).toEqual({ kind: 'side-panel', tabId: 'changes' });
   });
+
+  it('closes the window when the last-focused panel is hidden and one conversation remains', () => {
+    expect(
+      getSessionTabCloseTarget({
+        ...BASE_INPUT,
+        focusRegion: 'side-panel',
+        sidePanelOpen: false,
+        conversationTabCount: 1,
+      })
+    ).toEqual({ kind: 'window' });
+  });
+
   it('yields the window close accelerator on the empty surface', () => {
     expect(
       getSessionTabCloseTarget({
@@ -73,7 +98,7 @@ describe('getSessionTabCloseTarget', () => {
         sidePanelOpen: false,
         conversationTabCount: 0,
       })
-    ).toEqual({ kind: 'landing' });
+    ).toEqual({ kind: 'window' });
   });
   it('closes an available side-panel tab before yielding window close on the empty surface', () => {
     expect(

specs/desktop-windows.md

@@ -0,0 +1,57 @@
+# Desktop multi-window
+
+Status: draft
+Translation: current
+
+English | [中文](desktop-windows.zh.md)
+
+Users can view conversations and workspaces side by side; opening a window leaves
+its source window unchanged.
+
+| Action | Result |
+| --- | --- |
+| Ordinary Session click or workspace switch | Navigate in the current window |
+| Command-click on macOS, Control-click on other desktops | Open the target in a new window |
+| Session more/context menu: Open conversation in new window | Open a conversation window |
+
+Dragging out to create windows is unsupported; Session dragging retains mention
+insertion. The workspace selector shows the modifier-click hint at its bottom.
+Its context menu offers Open in new window without switching the current workspace.
+Session menus order actions as expand/collapse children, pin, mark unread, rename;
+copy link, copy branch, share; open PR, go to source Session, open in new window;
+archive. Separate groups without headings or empty groups, hide unavailable
+actions, and keep Open in new window penultimate and Archive last in ordinary text.
+
+Conversation windows initially collapse the left sidebar, open the requested
+conversation, and focus its composer once. The sidebar can be expanded.
+Workspace windows retain full navigation. Navigation, draft tabs, and panel state
+are independent per window.
+
+Composer drafts persist per workspace, isolated from other workspaces, regardless
+of which window opened them. All Chat Landing entries in a workspace reuse its
+composer draft. New conversation changes only the target project, preserving input;
+clear the draft only after the first message is successfully written to a Session.
+Closing another workspace window does not stop the CLI or Agent. Close menus and
+shortcuts act on the current window.
+
+Cmd/Ctrl+W in the conversation region closes the active tab when multiple tabs
+remain. With one tab, including a draft, it closes the current window without
+changing shared Session closure state. A focused side panel closes its active tab
+first. Explicit tab × still closes the tab. Primary and new conversation windows
+follow the same rule, preserving each window's native close/hide behavior.
+Application shortcut settings are device-wide and changes propagate to all open
+windows; execution acts only in the window receiving the key. The original window
+retains existing close/tray behavior; other workspace windows are not automatically
+restored.
+
+Hiding the sidebar unmounts its content and pauses Session prefetch; data required
+by the current conversation and Tasks page continues syncing. Only one window per
+workspace runs notifications, badges, and background status checks, handing off
+on exit. Cache clearing and logout are application-wide and close other windows
+to release connections.
+
+Workspace windows use the existing platform directory; the public desktop still
+has one local workspace. Shared UI multi-workspace entries must not change other
+windows' targets through global account selection.
+
+Requirement: [Issue #526](https://github.com/LodyAI/Lody/issues/526).

specs/desktop-windows.zh.md

@@ -1,7 +1,9 @@
 # 桌面多窗口
 
 Status: draft
-Translation: pending
+Translation: current
+
+[English](desktop-windows.md) | 中文
 
 用户可并排查看对话和工作区，打开新窗口不改变来源窗口。
 
@@ -27,6 +29,9 @@ Composer 草稿归属工作区并持久化：不同工作区必须隔离，工
 同一工作区内的所有 Chat Landing 入口复用同一份 Composer 草稿；“新建对话”只切换目标项目，
 不得清空或覆盖已有输入。只有首条消息成功写入 Session 后才清空这份草稿。
 关闭其他工作区窗口不停止 CLI 或 Agent；关闭菜单和快捷键操作当前窗口。
+Cmd/Ctrl+W 在对话区有多个标签时关闭当前标签，只剩一个标签（包括草稿）时关闭当前窗口，
+不更改会话的共享关闭状态。侧面板有焦点时优先关闭其当前标签；显式点击标签 × 仍关闭标签。
+主窗口和新开的会话窗口遵循相同规则，保留各窗口已有的原生关闭/隐藏行为。
 应用内快捷键配置按设备共享，任一窗口修改后对所有已打开窗口生效；快捷键执行仍只作用于接收按键的窗口。
 原始窗口保留已有的关闭/托盘行为；不自动恢复其他工作区窗口。