Function darken

public/js/folderManager.js:1216–1218

(hex, amt = 22)

  const { h, s, l } = hexToHsl(hex); return hslToHex(h, s, Math.min(100, l + amt));
}
function darken(hex, amt = 22) {
  const { h, s, l } = hexToHsl(hex); return hslToHex(h, s, Math.max(0, l - amt));
}

function applyFolderColorToOption(folder, hex) {
  // accepts folder like "root" or "A/B"