* feat(tracklist): play count, last played, and BPM columns (#516)
Adds three opt-in columns to Album / Playlist / Favorites tracklists,
plus the same fields in the Song Info modal. Picks up Navidrome's
existing `playCount` / `played` / `bpm` from the Subsonic response — no
new API calls.
- `SubsonicSong` gains `playCount`, `played`, `bpm` (already populated
by Navidrome's Subsonic API, just unmapped in the TS model).
- `albumTrackListHelpers.COLUMNS`, `PL_COLUMNS` (PlaylistDetail), and
`FAV_COLUMNS` (Favorites) get the three new entries. Genre also added
to the playlist column set for parity with the other two lists.
- Render uses `.track-duration` (12px tabular, centered, muted) for the
numeric stats and `.track-genre` (11px text, muted) for the relative
last-played timestamp via the existing `formatLastSeen` helper.
- Sort logic extended in `playlistDisplayedSongs`,
`useAlbumDetailSort`, and `useFavoritesSongFiltering` for the three
new keys.
- `SongInfoModal` gets matching rows (BPM / Play count / Last played).
- `useTracklistColumns.gridTemplate` / `gridMinWidth` fall back to the
ColDef's `defaultWidth` when a visible column has no saved width
(newly added column on an old prefs blob would otherwise emit
`undefinedpx` and collapse the row layout until reset-to-defaults).
- BPM cells skip the rendering when Navidrome returns 0 (default for
untagged files) — show `—` instead of `0`.
- i18n: `albumDetail.trackPlayCount / trackLastPlayed / trackBpm` and
`songInfo.playCount / lastPlayed / bpm` in all 9 locales.
Suggested by jbigginswyl (#516).
* docs(changelog): tracklist Plays / Last played / BPM columns (#730)
111 of 122 top-level src/utils/ files move into 16 topic folders (audio,
cache, cover, share, server, playback, playlist, deviceSync, waveform,
mix, format, export, changelog, ui, perf, componentHelpers). True
singletons with no cluster stay at the utils/ root.
Pure file-move: a path-aware codemod rewrote 539 relative-import
specifiers across 275 files; no logic touched. The hot-path coverage
gate list (.github/frontend-hot-path-files.txt) is updated to the new
paths for the 11 gated utils files — a mechanical consequence of the
move, not a CI change. tsc is green.