Backend for the upcoming TV/movie detail pages, isolated to video.db:
- show_detail(id): show + seasons->episodes tree with owned/total roll-ups
(season 0 -> 'Specials', missing-season-row episodes still grouped).
- movie_detail(id): movie + owned flag + best media-file (resolution/quality).
- get_art_ref generalizes the poster ref to poster|backdrop; new
/api/video/backdrop/<kind>/<id> streams the hero art server-side (Jellyfin
Backdrop vs Primary handled).
- /api/video/detail/{show,movie}/<id> endpoints.
Seam tests for the tree roll-ups, owned/file, art ref, and both endpoints.
Rebuilt the Library page to reuse the music library's exact look — no
reinvention, just new data:
- Same classes: .library-container, .library-artist-card grid, .alphabet-
selector, .library-search-input, loading/empty states. Movies/Shows tab pill
is the only video-specific bit.
- Real posters via a server-side proxy: GET /api/video/poster/<kind>/<id>
streams the Plex/Jellyfin artwork (token stays server-side); cards fall back
to an emoji on miss. list_movies/list_shows now expose has_poster (no raw
server paths leaked).
- Client-side search + A-Z letter filter (article-aware) over the loaded set;
cards are divs (not clickable yet, per request). Scan button in the header
reuses the shared scan controller and reloads on done.
110 tests green.
