[Requests and ideas] Title: Context and Changes panel do not update when selecting a repository wi...

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

Title: Context and Changes panel do not update when selecting a repository with no active sessionsUser Story:As a developer managing multiple repositories in the Copilot App, I want the active chat context and "Changes" panel to switch automatically to a newly selected repository, even if that repository does not have any active sessions yet, so that I can immediately begin working in the new context.Current Behavior:When multiple repositories are open in the "Sessions" tree, selecting a repository name that contains no active sessions fails to update the application state. The "Changes" panel and the Copilot chat context remain stuck on the previously selected session/repository.Expected Behavior:Clicking a repository or project name in the left panel should immediately shift the global application context (including the Chat context and Changes panel) to that repository, regardless of its session history.

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| Field | Value |
| --- | --- |
| App version | 1.0.10 |
| OS | Windows 10.0.26200 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Week 7 |

从 /chat 路径开始，通过打开多个仓库，然后选择一个没有活动会话的仓库来复现问题。跟踪 Chat 上下文和 Changes 面板使用的状态；当选择任何仓库都会更新两个面板（包括没有会话历史记录的仓库）时，工作即完成。

由索引模型根据 Issue 内容生成。