Collapses the three near-identical track rows (AlbumView's inline
TrackRow, ArtistPage's inline TrackRow with multi-select, and the
shared SearchTrackRow) into a single primitives/TrackRow driven by
flags, backed by one TrackItem (superset). Foundation for the
upcoming playlist module, which renders the artwork variant heavily.
- New primitives/TrackRow.slint with: show-artwork (cover+number vs
number cell), show-album, show-favorite, show-download,
multi-select-mode (selection checkbox). One media-action wires
play / play-next / queue / favorite / download / toggle-select +
the TrackContextMenu.
- TrackItem is the unified model (superset of the old AlbumTrackItem
+ SearchTrackItem: number, album, selected, artwork all present;
unused fields stay empty per surface).
- Migrated AlbumView (show-artwork:false, show-download:true),
ArtistPage Popular (show-artwork:false, multi-select-mode),
Search, Favorites, Mix (show-artwork:true, +album/+favorite).
Deleted SearchTrackRow.slint and both inline TrackRows.
- Rust: AlbumTrackItem + SearchTrackItem -> TrackItem across
album/artist/search/favorites/mix/main; search's internal row
struct renamed TrackRow -> TrackRowData to free the TrackRow name
for the Slint component. 46 tests pass.
cc