perf(tracklist): drop now-playing pulse + EQ-bar animations (#488)

* perf(tracklist): replace animated EQ-bar + active-row pulse with static icon

The currently-playing track in any tracklist (AlbumDetail, ArtistDetail,
PlaylistDetail, Favorites, RandomMix) was rendered with two animations
on top of an already-busy DOM:

- `.track-row.active` ran `track-pulse` 3s opacity 1 → 0.6 → 1 infinite
  on the entire row subtree (title button, several Lucide icons, star
  rating SVGs, hover affordances). Opacity is a compositor property, but
  on WebKitGTK without compositing — Linux + NVIDIA proprietary +
  WEBKIT_DISABLE_COMPOSITING_MODE=1 — every animated row falls back to a
  full software repaint of the subtree per frame.
- The "now playing" indicator in the track-number cell was three
  `<span class="eq-bar">` siblings with `transform: scaleY()` keyframes
  (`eq-bounce`), each on its own delay/duration. Same composite story:
  three software-repainted layers per frame, every frame.

On AlbumDetail (long tracklist + cover-art header background + the
already-running WaveformSeek progress rAF in the player bar) the
combined cost held the WebProcess at ~80 % CPU with 1.2 GB RSS for the
entire duration of playback. CPU dropped immediately on pause/stop;
on Composers / Settings (no track rows) the symptom never appeared.
Profiler confirmed continuous Layout & Rendering work synchronised with
isPlaying, not the canvas itself.

Replace both animations with static visuals:

- `.track-row.active` keeps the `--accent-dim` background, drops the
  pulse animation entirely.
- The "now playing" indicator becomes a single Lucide `AudioLines` icon
  (four vertical bars of different heights — reads as an EQ icon, no
  animation, one SVG per active row instead of three animated spans).
  `.eq-bars` className now only sets the accent colour.

Cleanup: dead `@keyframes track-pulse`, `@keyframes eq-bounce`,
`.eq-bars.paused` rule, plus a duplicate `.eq-bar` block in theme.css
(with a `wave` keyframe that was being shadowed by components.css and
had no other consumers).

No behaviour change beyond removing the animation; the row is still
visibly the active one and the icon still marks the playing track.

* docs: CHANGELOG entry for tracklist animation perf fix (PR #488)

CHANGELOG.md

@@ -179,6 +179,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * The **Playlists** icon in the collapsed sidebar was **off-centre** and had a **wider hover background** than every other item, because it still rendered through the expanded-mode wrapper (with `padding-right` and a `flex: 1` main link to fit the expand-toggle). Collapsed mode now reuses the **standard nav-link path** — same hitbox, same alignment as Artists, Albums, Favorites, etc.
 
+### Tracklist — drop now-playing pulse + EQ-bar animations
+
+**By [@Psychotoxical](https://github.com/Psychotoxical), PR [#488](https://github.com/Psychotoxical/psysonic/pull/488)**
+
+* The currently-playing track in any tracklist (**AlbumDetail**, **ArtistDetail**, **PlaylistDetail**, **Favorites**, **RandomMix**) ran an **`opacity` pulse** on the entire row plus three **`transform` keyframe** EQ-bar siblings — both compositor properties, but on **WebKitGTK without compositing** (Linux + NVIDIA proprietary + `WEBKIT_DISABLE_COMPOSITING_MODE=1`) every animated row falls back to a full **software repaint** of the subtree per frame. On AlbumDetail the combined cost held the WebProcess at **~80 % CPU** for the duration of playback; CPU dropped immediately on pause/stop.
+* `.track-row.active` keeps the **accent-tinted background** but no longer pulses. The "now playing" indicator becomes a single Lucide **`AudioLines` icon** (one SVG per active row instead of three animated spans). Cleanup: dead `track-pulse` + `eq-bounce` keyframes and a duplicate, shadowed `.eq-bar` block in `theme.css`.
+
 ## [1.45.0] - 2026-05-04
 
 ## Added