Extends Play later (end of the manual block) from track rows to every
surface that already offered Play next / Add to queue:
- playback.rs: enqueue_album_later, enqueue_playlist_later (mixed
sidecar interleave), enqueue_artist_top_later, enqueue_tracks_later,
enqueue_local_tracks_later — all NATURAL order (each add_track_later
appends, no reverse), QConnect controller routing via
play_later_batch_on_peer_if_active, and post-add queue sync.
- local_playlist::enqueue_later_by_id (source-aware rows, offline-only
stamp preserved), myqbz_play RowMode::PlayLater + BulkEnqueueMode.
- 19 dispatch arms in main.rs (album/playlist/artist/label/mix/
favorites/local-library/album-page/disc/myqbz dialects).
- 12 context menus + 10 bulk bars in .slint: list-plus icon between
Play next and Add to queue, popup heights bumped.
The immersive tap-action dropdown is deliberately untouched (it is a
configurable single-tap behavior setting, not a context menu).
km