Add TrackList.svelte, replacing TrackTable+TrackRow+TrackIndexCell+
TrackMeta and the 6 track tables (library, liked, mix, album,
playlist, album's library picker): declarative columns
(added/uploaded/plays) with fixed widths as module constants, an
index with an EQ indicator for the active track (or an overlay on the
art when index={false}, for the library picker), and a rowAction that
builds the form+IconButton (removeTrack/addTrack/deleteTrack) or a
direct onclick (Like).
AlbumTrackTable, PlaylistTrackTable and LibraryPicker are inlined
into their pages and removed, along with the 4 components TrackList
replaces.
Decision (recommended by the plan itself, not blocking): remove the
"Album" column, which in all 3 tables that had it always showed "—"
(a placeholder with no real data).
Verified with npm run check/build; no authenticated visual QA (Docker
unavailable this session).
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