[BUG] Claude Code 2.0.63 UI rendering broken + keyboard navigation not working on Ubuntu 24.04 via SSH

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?

Fresh install of Claude Code 2.0.63 on Ubuntu 24.04 via SSH has two critical issues:

1. UI rendering completely broken on startup — All UI elements (menu items, text, ASCII art logo) render at wrong coordinates, scattered randomly across the terminal. Claude Code fails to detect terminal dimensions correctly on initial launch. Resizing the terminal window triggers re-render and fixes layout.

1. Keyboard navigation non-functional — After fixing layout via resize, arrow keys still don't work for menu navigation (theme selector, etc.). Number keys and vim-style keys (j/k) also don't respond.

See attached screenshots showing the progression.

What Should Happen?

1. UI should render correctly on startup, respecting terminal dimensions
2. Arrow keys and keyboard navigation should work for menu selection

Error Messages/Logs

No error messages — the UI simply renders incorrectly and keyboard input is ignored.

Terminal diagnostics show everything is correct:
$ stty size → 52 140
$ echo $TERM → xterm-256color  
$ locale → en_US.UTF-8

Node.js receives correct key codes:
$ node -e "process.stdin.setRawMode(true); process.stdin.on('data', d => console.log([...d])); process.stdin.resume();"
Arrow up outputs: [ 27, 91, 65 ] ✓

Steps to Reproduce

1. Fresh Ubuntu 24.04 LTS server
2. Install Node.js 20.x via NodeSource
3. Install Claude Code: npm install -g @anthropic-ai/claude-code@2.0.63
4. SSH into server from macOS (iTerm2 or Terminal.app)
5. Run claude
6. Observe: UI is broken, text scattered across screen (Screenshot 1)
7. Resize terminal window → layout fixes (Screenshot 2)
8. Try arrow keys to navigate theme selector → nothing happens
9. Downgrade: npm install -g @anthropic-ai/claude-code@2.0.62
10. Run claude → everything works (Screenshot 3)

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.0.62

Claude Code Version

2.0.63

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

iTerm2

Additional Information

<img width="2880" height="1558" alt="Image" src="https://github.com/user-attachments/assets/9d0d2221-236d-408f-b651-8e78d5ed99c6" />
<img width="2800" height="1566" alt="Image" src="https://github.com/user-attachments/assets/fa1710fc-81ff-40dd-a002-87f86bd369d2" />
<img width="1441" height="782" alt="Image" src="https://github.com/user-attachments/assets/7780f037-e999-44f7-84b8-70ab1231134b" />