Ctrl+G fails to open $EDITOR during ask_user (clarifying question) prompts

### Describe the bug

When Copilot CLI asks a clarifying question via the  ask_user  tool (multiple-choice or freeform), pressing Ctrl+G does not open  $EDITOR  as it normally does in the main input box. Instead, the keypress causes the question to be registered as "skipped."

### Affected version

1.0.71

### Steps to reproduce the behavior

1. Have Copilot CLI ask a clarifying question (e.g., via  ask_user ).
2. While the question prompt is active, press Ctrl+G.
3. Observe: editor does not open; the question is immediately marked as skipped.

### Expected behavior

Ctrl+G should open  $EDITOR  for composing a response to the question, same as it does in the normal chat input box.

### Additional context

OS: macOS (Darwin)
$EDITOR: NeoVim

从 ask_user 提示的输入处理入手，将其 Ctrl+G 行为与 issue 中描述的主输入框路径进行比较。在 macOS 上使用 NeoVim 作为 $EDITOR 重现该问题；当 Ctrl+G 打开编辑器以输入回答，而不是将问题标记为已跳过时，即表示完成。

由索引模型根据 Issue 内容生成。