Cannot reliably change the Agent

Cannot reliably change the Agent

When trying to change the Agent, it often just no-ops without any feedback. I've also seen it show as though the agent has been changed, but then after the next prompt it reverts to the Default agent.

I have not yet found a reliable pattern or repro.

---
| Field | Value |
| --- | --- |
| App version | 1.0.25 |
| OS | Windows 10.0.26200 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Week 3 |

从 /chat 体验开始，并尝试在 Windows 10 上的应用版本 1.0.25 中更改 Agent。调查报告中的 no-op 以及恢复为 Default agent 的问题；完成的标准是，更改 Agent 会提供反馈，并且在下一个 prompt 后仍保持选中状态。

由索引模型根据 Issue 内容生成。