Antora UI updates for boostlook v3#606

Draft

julioest wants to merge 3 commits intodevelopfrom

feat/boostlook-v3

Commits on Feb 26, 2026

feat: redesign nav sidebar to match Figma — gray active indicator, pixel caret flip, section separators, clickable nav-items
julioest
committed

Commits on Feb 27, 2026

feat: persist nav toggle state and add toggle buttons for expandable sections
julioest
committed

Commits on Mar 20, 2026

fix: add aria-current attribute to last breadcrumb item for accessibility
julioest
committed