fa439d7c7b
Follow-up to the navbar sm->md change on this branch: the two header sidebar toggles were still gated at sm, so in the 768-991 band the DESKTOP toggle was shown while the navbar used the MOBILE drawer collapse state — clicking it flipped the wrong atom and the drawer could not be opened (sidebar unreachable at 768/820, caught by QA). Gate the mobile toggle hiddenFrom=md and the desktop toggle visibleFrom=md so the mobile toggle drives the drawer across the whole tablet band. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>