A new isolated Calendar page (/api/video/calendar) — every upcoming episode for
your owned shows across a real 7-day week (today first), as art cards sorted by
air time with a per-cell breathing colour glow.
- Air times: enrich shows with TVDB airsTime (new shows.airs_time column +
migration); cells show + sort by time, streaming (untimed/00:00) = "Anytime".
One-time background backfill re-queues already-matched shows for the time.
- Click an episode → styled modal (show backdrop hero, episode still/synopsis,
air date+time, owned badge, genres, "about the show"), with an explicit
"Open full show page" action instead of navigating on click.
- Isolated: reads only video_library.db, writes nothing to the music side.
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