Outer <button> becomes <div role="button" tabindex="0"> with keyboard
handlers (Enter/Space) so a real <button> for + queue can nest without
invalid HTML. New optional onPlay prop overrides the default
playQueue(tracks, index); used by the search Tracks section to call
playRadio(track.id) instead. + queue button calls enqueueTrack and
stops propagation so the row click does not fire.
Grid grows to 3 rows (auto / 1fr / auto); PlayerBar spans both columns
in the last row, rendering only when player.current is defined so the
row collapses before first play.
TrackRow becomes a <button> that dispatches playQueue(tracks, index).
Album page supplies the full track list + each index so the rest of
the album enqueues automatically when the user clicks a track.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
bvandeusen
