Addresses the 'feels basic' feedback:
- Hero is now a contained glass card with the backdrop blurred INSIDE it +
gradient overlay (same treatment as the music artist hero) — no more bare
gaps around the top/sides. Bigger poster, accent external-link chips
(IMDb/TMDB/TVDB), refined badges + stat tiles.
- Seasons are a poster-art card grid (season = album) with coverage rings/bars
and hover-lift, selecting one renders its episodes below (episode = track) —
episode overviews now shown. Mirrors the artist album-grid -> tracklist.
- Scan now captures real per-season posters (Plex sh.seasons() thumbs / Jellyfin
/Seasons Primary), served via get_art_ref('season') + /api/video/poster/season.
Falls back to the show poster until a re-scan populates them.
Seam tests for the season art ref; shell markup tests still green.
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