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_

Reproduce the issue in Copilot CLI 1.0.48 by submitting prompts ending with a question mark, including `How it works?`, and observe when the quick help notification appears. Trace the prompt-submission and help-notice handling entry points; done means ordinary questions submit without opening the help notice, while help behavior remains available when intentionally requested.

Written by the indexing model from the issue text.