feat: fans on local Navidrome artists (android) + harmonize web fan layout

- Android local artist page (ArtistDetailScreen/ArtistViewModel) now resolves the Deezer
  artist (fan-sorted, so same-name collisions pick the popular one) and shows "<n> Fans"
  under the name — parity with the web local artist page.
- Also migrated ArtistViewModel's preview to the app-level PreviewController: the local
  artist page had its OWN uncontrollable MediaPlayer preview, which had the same
  "keeps playing after navigating away" bug. Now every preview uses the global bar.
- Web: the artist-hero fan line was laid out in a row next to the name (flex without
  column direction) and used an odd tinted color — now stacked cleanly under the name in
  a muted white. SW ns-v54.
- CHANGELOG: documented the above + added a Known Bug (Android synced-lyrics auto-scroll
  still doesn't follow playback).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

CHANGELOG.md

@@ -74,12 +74,12 @@ Big change: **the entire metadata/search stack moved from Apple's iTunes to Deez
 - **Backend** — Removed the dead iTunes `/search` proxy and the Apple charts RSS proxy; the Deezer proxy (`/api/deezer/*`) now also serves charts and the editor lookup
 
 ### Added
-- **Web + Android** — **Same-name artist disambiguation**: Deezer's artist search isn't ranked by popularity, so a name collision (5 artists named "Joji") returned a niche one first — the artist page then loaded the wrong discography and owned songs didn't show as downloaded. Artists are now sorted by Deezer fan count, and on a local artist page with a real collision the pick is tie-broken by **song overlap** with your library (each artist has different songs). The **fan count is shown** on search artist cards and the artist page
-- **Android** — **Global 30s-preview control bar**: a preview started on an album/artist/Explore screen used to keep playing with no way to stop it once you navigated away. The preview now lives at the app level with a bar (above the mini player, on every screen) to pause/resume/stop it; starting real playback cancels the preview
+- **Web + Android** — **Same-name artist disambiguation**: Deezer's artist search isn't ranked by popularity, so a name collision (5 artists named "Joji") returned a niche one first — the artist page then loaded the wrong discography and owned songs didn't show as downloaded. Artists are now sorted by Deezer fan count, and on a local artist page (web) with a real collision the pick is tie-broken by **song overlap** with your library (each artist has different songs). The **fan count is shown** on search artist cards and on both the Deezer *and* local Navidrome artist pages (web + Android)
+- **Android** — **Global 30s-preview control bar**: a preview started on an album/artist/Explore screen used to keep playing with no way to stop it once you navigated away (the local artist page had its *own* uncontrollable preview too). All previews now run through one app-level player with a bar (above the mini player, on every screen) to pause/resume/stop it; starting real playback cancels the preview
 - **Backend** — Unit tests for the Deezer mapping/matching logic (`backend/test/deezer.test.js`, run with `npm test`), incl. per-track numbering, mixed-artist album-artist stability, explicit flags and the Japanese-title match guard. A live smoke test runs with `RUN_LIVE=1`
 
 ### Notes
-- Deploy: `git pull`, then rebuild the frontend (`docker compose up -d --build novasonic-frontend`) and restart the backend (`docker compose restart novasonic-backend`). Service worker bumped to `ns-v53`
+- Deploy: `git pull`, then rebuild the frontend (`docker compose up -d --build novasonic-frontend`) and restart the backend (`docker compose restart novasonic-backend`). Service worker bumped to `ns-v54`
 - Titles a user picked stay as chosen; only derived fields (album, album-artist, genre, year, artwork) follow Deezer
 
 ---
@@ -412,6 +412,7 @@ Primary causes identified:
 - **Web + Android** — yt-dlp backend update / maintenance
 
 ### Known Bugs
+- **Android (lyrics)** — Synced-lyrics **auto-scroll still does not follow playback**: the current line is highlighted but the list doesn't scroll to keep it centered, so you have to scroll by hand. Web autoscroll works. Not yet fixed.
 - **Web (PWA, desktop)** — The Windows media tile (SMTC) briefly closes and reopens when skipping tracks. Swapping the `<audio>` element's source leaves a momentary gap with no active media output, so Windows tears down and rebuilds the tile. A real fix needs one continuous source (MSE), which requires streaming an MSE-compatible format. The native Android app is unaffected. (The two-element gapless handoff added in 1.1 makes skips effectively instant but does **not** fix this — switching elements still ends and restarts the OS session.)
 - **Backend (download)** — The duplicate check requires at least a `firstArtist` folder match. If the same song was previously stored under a very different artist name (e.g. before an iTunes-name fix), it will not be detected as a duplicate and will be re-downloaded.
 - **Backend (metadata/sorting)** — MusicBrainz `release['artist-credit']` is often absent in the standard recording search response (requires `inc=artist-credits` which can slow the endpoint). The albumArtist field from MusicBrainz autofill may fall back to the recording artist rather than the release artist.