[BUG] Media Play/Pause key inserts [57430u in input

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?

Play/Pause media key (Logitech mouse shortcut) inserts [57430u as literal text in the input line while Claude Code is running. Works fine in plain PowerShell.

What Should Happen?

Media keys should be ignored or passed through to the OS, not captured as input.

Error Messages/Logs

No error, just `[57430u` showing up as text in the input line.

Steps to Reproduce

1. Run claude in PowerShell
2. Press Play/Pause media key (in my case, a Logitech mouse button mapped to Play/Pause)
3. [57430u appears in the input

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.84 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

PowerShell

Additional Information

Same class of bug as #38624, #17386, #16801 — Claude Code activates Kitty keyboard protocol but doesn't filter keycodes it doesn't handle. 57430 = Media Play/Pause in the Kitty spec.