The detail actions row still toggled the old shows.monitored flag via
/api/video/monitor. Now it's consistent with the cards:
- The 'Watchlist' button appears only for AIRING shows (movies + ended shows are
terminal — they keep acquisition, not a watch-follow).
- It reads/writes the new /api/video/watchlist add/remove, resolves the real
watched state on load (airing library shows are on by default), confirms on
remove (the standard dialog), toasts, and broadcasts the change so the nav
badge + watchlist page stay in sync.
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