Both pages reimplemented the same accessors over the target union and a
byte-identical queue-item mapper. Moves the domain type (renamed
ContextMenuTarget -> TrackTarget, since tiles and the queue use it too)
and its helpers to $lib/tracks.ts; TrackContextMenu keeps only its menu
geometry. Home drops from 341 to ~230 lines.
Unifies two divergences the duplication was hiding: home compared the
active tile against track.id while the queue is keyed by
queueIdForTrack, so YouTube-sourced tracks never highlighted; and it
hardcoded explicit to false for local tracks, hiding the badge.
Also cancels in-flight youtube filler results when the effect re-runs,
so a slow response cannot overwrite newer ones.
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