Enable plan mode via /plan command

[ahmadawais]

Summary

Not sure why we don't have this.

Enable plan mode via /plan command

https://x.com/perleklak/status/2055341366411215024

Expected Behavior

/plan to enable plan mode

Actual Behavior

Nothing right now. Have to shift+tab

Steps to reproduce the issue

/plan doesn't work

Command Code Version

0.26.7

Operating System

macOS

Terminal/IDE

ghostty

Shell

zsh

Additional context

No response