/fork should open a new window

Question

### What version of Codex CLI is running?

codex-cli 0.114.0

### What subscription do you have?

Pro

### Which model were you using?

NA

### What platform is your computer?

Linux 6.6.87.2-microsoft-standard-WSL2 x86_64 x86_64

### What terminal emulator and version are you using (if applicable)?

Windows Terminal

### What issue are you seeing?

Unsure if this is a bug or a feature request, but /fork should result in a second active chat in a new terminal window.

### What steps can reproduc