Drops out of autopilot after each request

### Describe the bug

It used to be that I would go into autopilot at the beginning (by pressing Shift + Tab twice). Then I would give it a prompt and it would stay in autopilot. I knew this because of the color, the autopilot color was Green (now it's Purple) The color change is fine, but the issue is after a prompt of it being Purple then after the prompt is done it goes back to being Grey. I hit shift tab twice again to put it back into Purple, and then when the prompt is done it goes back to Grey again. Its unclear if its still in autopilot mode. Is it ? Why does it keep going back to Grey after each prompt ? Makes it very hard to tell if i'm still in Autopilot mode. Not sure if this was a bug or a design choice but it makes it very confusing what mode im in.

Thanks

### Affected version

_No response_

### Steps to reproduce the behavior

_No response_

### Expected behavior

_No response_

### Additional context

_No response_

首先在 Copilot CLI 中重現此情況：按兩次 Shift+Tab 進入 autopilot，提交一個提示，並觀察之後模式和顏色是否變更。未指定任何檔案、測試或受影響的版本；當 autopilot 狀態清楚，且在每次要求後都與顯示的指示器保持一致時，即表示完成。

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