No longer a stub. The modal now captures the title's tmdb id + per-episode meta
(title/air_date, including lazily-loaded tmdb seasons), and on submit:
- movie -> POST /wishlist/add {movie} (owned -> 'queued for re-download')
- show -> POST /wishlist/add {show, episodes:[selected S/E]}; if the 'Add to
watchlist' tick is on, also POST /watchlist/add for the show.
Fires soulsync:video-wishlist-changed (+ watchlist-changed) so badges/pages
refresh, toasts the result, and closes. Every card surface (discover, search,
library, watchlist, detail) funnels through here, so they're all live now.
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