Preserve question_tool rendered output (description/question/choices) when user presses Escape to dismiss

### Describe the bug

When the agent presents a question or multiple-choice prompt, pressing Escape to dismiss it (e.g. to run a quick `!` shell command or interact with the agent differently) causes the entire question block to collapse into a single unreadable line. The original multi-line formatting — choices, context, spacing — is lost.

This makes it difficult to reference what the agent asked, especially when you want to come back and answer the question after checking something first.

### Steps to reproduce

1. Give the agent a prompt that triggers a question with multiple choices
2. Agent renders a nicely formatted question with options
3. Press **Esc** to dismiss the question (e.g. to run a `!` command first)
4. Observe: the question collapses into a single line of concatenated text, losing all formatting

### Expected behavior

When a question/choices prompt is dismissed via Escape, the rendered text should preserve its original multi-line formatting. The question should remain readable in the conversation history so the user can:

- Reference it after running a quick shell command
- Copy/paste from it
- Re-read the options before deciding how to respond

### Additional context

This is a common workflow — the agent asks a question, but before answering you want to check something (e.g. `!ls`, `!git status`, `!cat some-file`) to make an informed choice. The collapsed question text makes it hard to remember what was asked.

Related to #2733 Agent pushes user toward implementation choices while still in plan mode

首先使用多项选择提示复现 question_tool 流程，然后跟踪按下 Escape 将其关闭后，渲染出的输出被添加到对话历史时发生了什么。当描述、问题、选项、间距和换行在关闭后仍保持可读时，这项工作就完成了；issue 中没有指定文件或测试。

由索引模型根据 Issue 内容生成。