{% comment %} Vertical nav for sidebars. The container styles its item links via descendant selectors (keyed on the `.is-current` marker the item adds when current), so items stay structural. - default: filled active rows - variant="sidebar": accent left-bar rail (continuous, no row gap) When `persist_scroll` is set and the navlist is its own scroll container (give it a max-height plus overflow-y-auto), it remembers its scroll position across full page loads via sessionStorage, keyed on `scroll_key`. It only restores that position when you navigated via a link inside this navlist, so arriving from an unrelated page (a top nav, an external link) starts at the top rather than resuming a stale position. Useful for long sidebars so the list does not jump to the top on every in-nav navigation. {% endcomment %}