[BUG] Numpad slash key outputs raw CSI u escape sequence instead of / character

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?

When pressing the forward slash (/) key on the numeric keypad, Claude Code displays the raw escape sequence [57410u in the input prompt instead of the expected / character.

Analysis:
The sequence [57410u is a CSI u (kitty keyboard protocol) escape sequence where 57410 is the keycode for KP_Divide (numeric keypad division/slash). It appears Claude Code's terminal input handler is not properly translating extended keyboard protocol sequences for numpad keys.

What Should Happen?

A forward slash / character should be inserted at the cursor position.

Error Messages/Logs

Steps to Reproduce

1. Open Claude Code CLI
2. Start typing in the prompt
3. Press the / key on the numeric keypad (not the main keyboard)

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.0.76

Claude Code Version

2.1.1 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_