Pagination (regression): the IntersectionObserver sentinel only fires on
intersection *changes*, so a short first page kept it on-screen and it never
re-fired — stuck at 20 — and I'd hidden the Load more button whenever IO exists,
leaving no fallback. Now:
- Load more button is always shown while there's more (the reliable control).
- Auto-load is self-correcting: track sentinel visibility and, after each load,
pull again via rAF if it's still on-screen (rAF lets the observer update first
so a cached category doesn't load every page at once).
- page increment moved inside loadGrid so the button + sentinel can't double-bump.
Caching: cachedFetch() memoizes /discover/list responses per URL for the session
(rails + grid pages) — revisits, paging and reopening a category are instant and
don't re-hit TMDB.
Responsive: small-screen pass for the Browse panel, hero (height/title/actions
full-width), grid header wrap, and the trailer close button (kept on-screen).
Also fixed the ambient layer's 130% width that could cause horizontal scroll.
246c650db4