[BUG] tab-to-toggle-thinking should ignore tab combined with other keys

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?

Pressing CTRL+TAB to switch tabs in the macOS terminal, when no other tabs exist, will toggle thinking mode. This is an oopsie I make like 5 times a day. It's moderately annoying that it accidentally also toggles thinking off! I almost always want it on.

What Should Happen?

Claude code ignores the CTRL+TAB (⎈+↹) combination, responding only to TAB (↹)

Error Messages/Logs

Steps to Reproduce

1. Run claude code in the macos terminal with no other tabs
2. Try to switch tabs with ⎈+↹
3. See thinking mode toggle

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.0.53

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

NGL, this should only be a few lines of code to fix. I know y'all use react, so, easier?