Copy/paste does not work while agent is showing an interactive question with Wez's terminal emulator.

### Describe the bug

### Summary

With WezTerm, Paste-into-prompt does not work while the agent is displaying an interactive question (the elicitation/ask_user form). Pasting works normally outside of these prompts.

### Repro

1. Using wezterm, start an interactive session with `copilot`.
2. Ask the agent something that causes it to invoke the elicitation/ask_user tool (i.e. it presents a form-style question with one or more fields).
3. Try to paste text into one of the form fields.

### Expected

Standard terminal paste should populate the field with clipboard contents.

### Actual

Paste keystroke is dropped or otherwise has no effect on the form field. Direction affected: **paste-in only** (copy-out from these prompts was not specifically tested).

### Environment

- Copilot CLI version: `1.0.49-1` (`GitHub Copilot CLI 1.0.49-1`)
- OS: Windows 10.0.26200 (Windows 11)
- Shell: PowerShell 7.5.5
- Terminal: **wezterm**

### Notes

- Reproducible across multiple prompts; happens specifically and only during the ask_user / elicitation form rendering, not during normal output or normal user-input lines.
- Workaround: cancel the form, paste the value into the next free-form prompt, and re-trigger the question. Not a fix.

### Impact

Mild but recurring friction — every time the agent asks a structured question that needs pasted content (IDs, URLs, long titles, etc.), the user has to type or work around the form.

### Affected version

_No response_

### Steps to reproduce the behavior

_No response_

### Expected behavior

_No response_

### Additional context

_No response_

先从 ask_user/elicitation 表单的渲染和输入处理入手，然后按照列出的步骤在 WezTerm 中重现该问题。比较普通自由格式提示和表单字段中的粘贴行为；当标准终端粘贴能够填充字段且不影响正常输入时，即视为完成。

由索引模型根据 Issue 内容生成。