I often have multiple sessions running.

I often have multiple sessions running.
It would be nice to get a quick list of active sessions.
This would be nice as a whole, not just per project.

Active here can mean 2 things and I think both are useful:

1. Interacted with recently (like say... in the last hour) but may currently be idle.
2. Agent session is actively doing something and I'm waiting for a result.

---
| Field | Value |
| --- | --- |
| App version | 1.0.17 |
| OS | NixOS 26.5.0 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Week 6 |

从应用中的 /chat 路径开始，追踪会话如何跨项目表示和限定范围。定义一个快速列表，涵盖最近交互过的会话以及当前正在执行工作的会话，并针对已报告的用例确认其行为。

由索引模型根据 Issue 内容生成。