[BUG] Command / Custom-Commands list missing last N-1 row bottom padding in /help command

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Command / Custom-Commands list missing last N-1 row bottom padding in /help command.

Currently, when view the command and custom-commands list in the TUI. The last row is missing and being overlapped from the bottom info message.

<img width="891" height="498" alt="Image" src="https://github.com/user-attachments/assets/32eba8b5-81aa-48e8-969e-fad7a9851093" />
<img width="946" height="516" alt="Image" src="https://github.com/user-attachments/assets/7352a4c5-2c42-4048-9b40-a4a0d46a2951" />

What Should Happen?

Suggestion: to add a bottom N-1 padding list, so that the last selection is always deferred to non-bottom view only. To avoid the gap.

Error Messages/Logs

Steps to Reproduce

1. Open Claude Code
2. Open /help command
3. View the tabbed horizontal list
4. Press < or > arrow keyboard to switch to "Command" and "Custom-Command" Tab
5. Scroll the list to last item

<img width="891" height="498" alt="Image" src="https://github.com/user-attachments/assets/7b247b06-839f-4b43-a09d-c4f4a2080f65" />

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

v2.1.68

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

Note: I use Ghostty terminal.