Unable to switch tabs with keyboard

### Describe the bug

After installing and running GitHub Copilot CLI, the active Gists tab is unreachable by pressing the right arrow key.

### Affected version

GitHub Copilot CLI 1.0.68

### Steps to reproduce the behavior

1. Run GitHub Copilot CLI without logging in
2. Press the right arrow key, as suggested by the interface
3. Observe that nothing happens on screen

### Expected behavior

The Gists tab should be displayed.

### Additional context

If you click the Gists tab with the mouse, you can reach it.
If you press the right or left arrow key from the Gists tab, you can return to the Session tab, as shown in the attached screen recording.

https://github.com/user-attachments/assets/528163bb-d4ac-48ef-bf4d-507d3e4b4d09

首先，在注销状态下，使用 Session 选项卡中的右箭头键，重现 GitHub Copilot CLI 1.0.68 中的键盘导航故障。跟踪选项卡导航入口点，并验证使用箭头键可以打开 Gists 选项卡，同时鼠标导航和反向导航仍然正常工作。

由索引模型根据 Issue 内容生成。