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

Start by reproducing the keyboard navigation failure in GitHub Copilot CLI 1.0.68 while logged out, using the right arrow key from the Session tab. Trace the tab-navigation entry point and verify that the Gists tab opens with the arrow key while mouse navigation and reverse navigation still work.

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