[Requests and ideas] On macOS, closing the last window (⌘W) should keep the app running in the bac...

**Mood:** 🎉
**Category:** Requests and ideas

On macOS, closing the last window (⌘W) should keep the app running in the background (like Slack, Discord, or most native Mac apps). Currently it terminates the process, so reopening requires a full cold start. Ideal behavior: close the window but leave the app active in the Dock/menu bar, with ⌘N or clicking the Dock icon to reopen instantly.

---
| Field | Value |
| --- | --- |
| App version | 0.2.30 |
| OS | macOS 26.5.0 |
| Theme | Fox |
| Path | /chat |
| Tenure | Day 2 (Week 1) |

首先跟踪 macOS 窗口关闭和应用程序生命周期的处理方式；该 issue 没有指定具体的文件或测试。检查 ⌘W 当前如何影响最后一个窗口和进程，然后验证关闭该窗口后，应用仍可通过 ⌘N 或 Dock 重新打开，而无需冷启动。

由索引模型根据 Issue 内容生成。