[BUG] Alt+M keyboard shortcut to cycle modes broken on Windows in 2.1.x

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?

Description

The Alt+M keyboard shortcut to cycle through modes (plan mode, auto mode, etc.) does not work on Windows in version 2.1.x.

## Environment

• Claude Code version (broken): 2.1.6, 2.1.7
• Claude Code version (working): 2.0.77
• OS: Windows
• Terminals tested: Windows Terminal, WezTerm

## Steps to reproduce

1. Install Claude Code 2.1.7 (or 2.1.6)
2. Start a new claude session
3. Press Alt+M to cycle modes
4. Nothing happens

## Expected behavior
Alt+M should cycle through modes (normal → plan mode → auto mode, etc.)

## Actual behavior

• Alt+M does nothing
• Shift+Tab (documented alternative) also behaves unexpectedly:
• In plan mode: does nothing
• Outside plan mode: shows "toggle thinking with meta+t" instead of cycling modes

## Workaround
Downgrade to version 2.0.77 where Alt+M works correctly:
npm install -g @anthropic-ai/claude-code@2.0.77

## Additional context
This appears to be a regression introduced somewhere between 2.0.77 and 2.1.0.

What Should Happen?

cycle permission modes

Error Messages/Logs

Steps to Reproduce

press alt m and watch nothing happen

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.0.77

Claude Code Version

2.1.7

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

broken in windows terminal and wezterm on latest version of claude code