Checklist

• I have read through the manual page (man fzf)
• I have searched through the existing issues
• For bug reports, I have checked if the bug is reproducible in the latest version of fzf

Output of fzf --version

0.57.0

OS

• Linux
• macOS
• Windows
• Etc.

Shell

• bash
• zsh
• fish

Problem / Steps to reproduce

Some terminals suport:
https://github.com/contour-terminal/contour/blob/master/docs/vt-extensions/color-palette-update-notifications.md#dark-and-light-mode-detection

fzf should leverage it, to automatically apply --color=light or --color=dark at startup if colors are not set by the user.