The 'Where to Watch' section is now actionable:
- For an OWNED title it leads with a 'Play on Plex/Jellyfin' tile (green, play
glyph) that deep-links straight to the item on your server — Plex via the
app.plex.tv web app (machineIdentifier fetched once + cached), Jellyfin via its
web detail page. Built in engine.item_extras from the row's server_source +
server_id and the shared media-server config (same source poster.py uses).
- Streaming providers (TMDB/JustWatch) are now clickable → the where-to-watch
page, with a hover lift.
Owned-only: preview (tmdb) items have no library row so they get no server tile.
Seam tests cover the Jellyfin + Plex link building and the unowned no-link case.
240 video-suite tests pass.