PublicLayout wraps the routed page in <AnimatePresence> keyed by
pathname+search, so changing ?type=… fully unmounts the page and creates
a fresh FilterChips. A useRef-based save/restore therefore reset on
every filter switch. Persist the scrollLeft in a module-level value
that survives the unmount, restore synchronously on mount, and keep an
~1.5s post-mount watch window for the iOS Safari sticky relayout that
asynchronously snaps scrollLeft back to 0. Also gate the inactive-chip
hover color behind [@media(hover:hover)] so iOS sticky-hover no longer
leaves a faint gold tint on the last-tapped filter.
Both routes render the same MessageStream; the layout wrapper used to inset
/category by px-4 / sm:px-6 on mobile while /browse stayed edge-to-edge,
shrinking bubble width and making the category waterfall feel narrower
than the all-resources page.
