Question mark at the end of the prompt sometimes opens help notice after submitting

### Describe the bug

From time to time, prompts ending with a question mark open a quick help notification.

### Affected version

1.0.48

### Steps to reproduce the behavior

1. Ask a question with a question mark at the end of the prompt. (`> How it works?`)

### Expected behavior

_No response_

### Additional context

_No response_

在 Copilot CLI 1.0.48 中提交以问号结尾的 prompt（包括 `How it works?`）来复现该问题，并观察快速帮助通知何时出现。跟踪 prompt 提交和帮助提示处理的入口点；完成的标准是普通问题提交时不会打开帮助提示，同时在有意请求时帮助行为仍然可用。

由索引模型根据 Issue 内容生成。