robbyrussel - Arrow does not turn red when previous command failed

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct

### What would you like to see changed?

For theme robbyrussel on oh my zsh, the arrow turns red when previous command failed.

Current behavior:

<img width="1336" height="336" alt="Image" src="https://github.com/user-attachments/assets/e66f3152-6a53-4592-80ca-31a25b554a70" />