Cannot type Polish characters (AltGr combinations) in Copilot CLI input on Windows

### Describe the bug

It is impossible to type characters that require the AltGr key (right Alt) in the Copilot CLI input field. This affects Polish characters: ą, ę, ó, ś, ź, ż, ć, ń, ł — and likely other languages using AltGr combinations

### Affected version

1.0.34

### Steps to reproduce the behavior

1. Open Copilot CLI on Windows
2. Try to type a Polish character using AltGr + letter (e.g., AltGr+A for ą, AltGr+L for ł)
3. Nothing is typed, or a wrong character/action is triggered

### Expected behavior

AltGr key combinations should produce the correct Unicode characters in the input field.

### Additional context

- OS: Windows
- Terminal: Windows Terminal / PowerShell

使用波兰语键盘布局，通过 Windows Terminal 或 PowerShell 在 Copilot CLI 1.0.34 中重现该问题，然后跟踪 CLI 对 AltGr 组合键的输入处理。完成标准是可以正确输入 ą 和 ł 等波兰语字符，而不会触发意外的字符或操作。

由索引模型根据 Issue 内容生成。