[Requests and ideas] I wish the project sessions were cleaner.

**Mood:** 😊
**Category:** Requests and ideas

I wish the project sessions were cleaner. Could you add an auto-timeout feature? When the timeout ends, it could delete old sessions.

For example, automatic deletion after 7 days

---
| Field | Value |
| --- | --- |
| App version | 0.2.28 |
| OS | macOS 26.2.0 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Day 6 (Week 1) |

该 issue 未指定任何文件、测试或入口点。首先定位项目会话的存储方式及其生命周期管理方式，然后明确七天超时是否可配置，以及什么情况会被视为旧会话。完成的标准是：过期会话会被自动删除且不会影响活动会话，并且超时和清理行为都有测试覆盖。

由索引模型根据 Issue 内容生成。