// T17 stub — collapsible rail with localStorage persistence.
// Chat lands in Plan 5.
import { el, mount } from '../dom.js';

const KEY = 'void_rail_collapsed';

export function renderRightrail(root) {
  const shell = document.getElementById('shell');
  let collapsed = localStorage.getItem(KEY) === 'true';
  if (collapsed) shell.classList.add('rail-collapsed');

  function toggle() {
    collapsed = !collapsed;
    localStorage.setItem(KEY, String(collapsed));
    shell.classList.toggle('rail-collapsed', collapsed);
  }

  mount(root,
    el('div', { class: 'rail-toggle', onclick: toggle, title: 'Toggle right rail' }, 'CRADLE'),
    el('div', { class: 'rail-body' },
      el('h3', { style: { marginTop: 0 } }, 'Companion'),
      el('p', { class: 'muted' }, 'Chat lands in Plan 5. The rail is here so the layout is honest about the empty space it will take.')
    )
  );
}