Function updateToggleForOption

public/js/folderManager.js:1145–1177

(folder, hasChildren)

   Toggle (chevron) helper
----------------------*/
function updateToggleForOption(folder, hasChildren) {
  const opt = document.querySelector(`.folder-option[data-folder="${CSS.escape(folder)}"]`);
  if (!opt) return;
  const row = opt.closest('.folder-row');
  if (!row) return;

  let btn = row.querySelector('button.folder-toggle');
  let spacer = row.querySelector('.folder-spacer');

  if (hasChildren) {
    if (!btn) {
      btn = document.createElement('button');
      btn.type = 'button';
      btn.className = 'folder-toggle';
      btn.setAttribute('data-folder', folder);
      btn.setAttribute('aria-label', 'Expand');
      if (spacer) spacer.replaceWith(btn);
      else row.insertBefore(btn, opt);
    }
  } else {
    if (btn) {
      const newSpacer = document.createElement('span');
      newSpacer.className = 'folder-spacer';
      newSpacer.setAttribute('aria-hidden', 'true');
      btn.replaceWith(newSpacer);
    } else if (!spacer) {
      spacer = document.createElement('span');
      spacer.className = 'folder-spacer';
      spacer.setAttribute('aria-hidden', 'true');
      row.insertBefore(spacer, opt);
    }
  }
}

/* ----------------------
   Colors