Video Discover page: trending hero + lazy genre/decade rails + filter grid
A browse-everything page for TMDB titles you don't own yet.
Backend:
- TMDBClient: discover() (genre/year/decade), curated() (popular / top_rated /
now_playing / upcoming / on_the_air / airing_today), genres(); shared
_disc_map() that carries backdrop + overview. trending() now routes through it.
- Engine: discover_curated / discover_filter / genre_list (cached + owned-
annotated via library_id_for_tmdb) + _stamp_owned helper.
- api/video/discover.py: /discover/hero, /discover/genres, /discover/list
(curated key | filtered kind+genre+year+decade+sort, paged).
Frontend (video-discover.js + .vdsc-* CSS + subpage markup):
- Cross-fading trending hero slideshow (per-title hue, dots, hover-pause,
reduced-motion safe, click -> detail).
- Deep stack of Netflix-style rails (curated + every movie genre + decades),
each lazy-loaded on scroll via IntersectionObserver, arrow scrollers,
reusing the search card (owned 'In Library' / 'Preview' ribbon + get button).
- Filter bar (kind / genre / decade / sort) flips into a paged 'Load more' grid.
- Cards open detail through the shared soulsync:video-open-detail event.
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