feat: Waveform seekbar, MilkDrop visualizer, EQ bars, in-app browser, and UX improvements (v1.3.0)

- PlayerBar redesigned: canvas waveform seekbar (500 bars, blue→mauve gradient + glow) replaces thin slider; new flex layout; queue toggle moved to content header (consistent with sidebar pattern)
- MilkDrop visualizer in Ambient Stage via Butterchurn; hidden audio analysis, preset shuffle, smooth blend transitions
- Tracklist: animated EQ bars for playing track, play icon when paused, align-items: center fix
- Artist pages: Last.fm + Wikipedia open in native Tauri WebviewWindow (in-app browser)
- Hero/Discover deduplication: single fetch of 20 random albums split between sections
- Update checker: runs every 10 minutes during runtime; version shown without v-prefix
- Settings version: now read from package.json instead of hardcoded
- Help page: new Random Mix section, updated Playback + Library sections, improved accordion styling
- Bump version to 1.3.0

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/FullscreenPlayer.tsx

@@ -1,12 +1,13 @@
 import React, { useCallback, useEffect, useState, useRef, memo } from 'react';
 import {
   Play, Pause, SkipBack, SkipForward,
-  ChevronDown, Repeat, Repeat1, Square, Music
+  ChevronDown, Repeat, Repeat1, Square, Music, AudioWaveform, Shuffle
 } from 'lucide-react';
 import { usePlayerStore } from '../store/playerStore';
 import { buildCoverArtUrl, coverArtCacheKey, getArtistInfo } from '../api/subsonic';
 import CachedImage, { useCachedUrl } from './CachedImage';
 import { useTranslation } from 'react-i18next';
+import VisualizerCanvas from './VisualizerCanvas';
 
 function formatTime(seconds: number): string {
   if (!seconds || isNaN(seconds)) return '0:00';
@@ -147,6 +148,10 @@ export default function FullscreenPlayer({ onClose }: FullscreenPlayerProps) {
   const stop         = usePlayerStore(s => s.stop);
   const toggleRepeat = usePlayerStore(s => s.toggleRepeat);
 
+  const [vizActive, setVizActive] = useState(false);
+  const [nextPresetTrigger, setNextPresetTrigger] = useState(0);
+  const [presetName, setPresetName] = useState('');
+
   const duration = currentTrack?.duration ?? 0;
   const coverUrl = currentTrack?.coverArt ? buildCoverArtUrl(currentTrack.coverArt, 800) : '';
   const coverKey = currentTrack?.coverArt ? coverArtCacheKey(currentTrack.coverArt, 800) : '';
@@ -177,20 +182,59 @@ export default function FullscreenPlayer({ onClose }: FullscreenPlayerProps) {
   return (
     <div className="fs-player" role="dialog" aria-modal="true" aria-label={t('player.fullscreen')}>
 
-      {/* Layer 1 — blurred artist image (falls back to cover art) */}
-      <FsBg url={bgUrl} />
-      <div className="fs-bg-overlay" aria-hidden="true" />
-
-      {/* Layer 2 — drifting color orbs */}
-      <div className="fs-orb fs-orb-1" aria-hidden="true" />
-      <div className="fs-orb fs-orb-2" aria-hidden="true" />
-      <div className="fs-orb fs-orb-3" aria-hidden="true" />
+      {/* Layer 1 — blurred artist image OR visualizer */}
+      {vizActive && currentTrack ? (
+        <VisualizerCanvas
+          trackId={currentTrack.id}
+          nextPresetTrigger={nextPresetTrigger}
+          onPresetName={setPresetName}
+        />
+      ) : (
+        <>
+          <FsBg url={bgUrl} />
+          <div className="fs-bg-overlay" aria-hidden="true" />
+          <div className="fs-orb fs-orb-1" aria-hidden="true" />
+          <div className="fs-orb fs-orb-2" aria-hidden="true" />
+          <div className="fs-orb fs-orb-3" aria-hidden="true" />
+        </>
+      )}
 
       {/* Close */}
       <button className="fs-close" onClick={onClose} aria-label={t('player.closeFullscreen')}>
         <ChevronDown size={28} />
       </button>
 
+      {/* Visualizer toggle + preset controls */}
+      <div style={{ position: 'absolute', top: '1.25rem', right: '4rem', display: 'flex', alignItems: 'center', gap: '0.5rem' }}>
+        {vizActive && (
+          <>
+            {presetName && (
+              <span style={{ fontSize: 11, color: 'rgba(255,255,255,0.5)', maxWidth: 200, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>
+                {presetName}
+              </span>
+            )}
+            <button
+              className="fs-btn fs-btn-sm"
+              onClick={() => setNextPresetTrigger(n => n + 1)}
+              aria-label={t('player.nextPreset')}
+              data-tooltip={t('player.nextPreset')}
+              style={{ color: 'rgba(255,255,255,0.7)' }}
+            >
+              <Shuffle size={14} />
+            </button>
+          </>
+        )}
+        <button
+          className={`fs-btn fs-btn-sm ${vizActive ? 'active' : ''}`}
+          onClick={() => setVizActive(v => !v)}
+          aria-label={t('player.visualizer')}
+          data-tooltip={t('player.visualizer')}
+          style={{ color: vizActive ? 'white' : 'rgba(255,255,255,0.5)' }}
+        >
+          <AudioWaveform size={16} />
+        </button>
+      </div>
+
       {/* Center stage — everything vertically + horizontally centered */}
       <div className="fs-stage">
 

src/components/Hero.tsx

@@ -42,7 +42,11 @@ function HeroBg({ url }: { url: string }) {
   );
 }
 
-export default function Hero() {
+interface HeroProps {
+  albums?: SubsonicAlbum[];
+}
+
+export default function Hero({ albums: albumsProp }: HeroProps = {}) {
   const { t } = useTranslation();
   const navigate = useNavigate();
   const [albums, setAlbums] = useState<SubsonicAlbum[]>([]);
@@ -50,8 +54,9 @@ export default function Hero() {
   const timerRef = useRef<ReturnType<typeof setInterval> | null>(null);
 
   useEffect(() => {
+    if (albumsProp?.length) { setAlbums(albumsProp); return; }
     getRandomAlbums(8).then(a => { if (a.length) setAlbums(a); }).catch(() => {});
-  }, []);
+  }, [albumsProp]);
 
   // Start / restart auto-advance timer
   const startTimer = useCallback((len: number) => {

src/components/PlayerBar.tsx

@@ -1,10 +1,12 @@
 import React, { useCallback, useMemo } from 'react';
 import {
-  Play, Pause, SkipBack, SkipForward, Volume2, VolumeX, Music, List, Square, Repeat, Repeat1, Maximize2
+  Play, Pause, SkipBack, SkipForward, Volume2, VolumeX, Music,
+  Square, Repeat, Repeat1, Maximize2
 } from 'lucide-react';
 import { usePlayerStore } from '../store/playerStore';
 import { buildCoverArtUrl, coverArtCacheKey } from '../api/subsonic';
 import CachedImage from './CachedImage';
+import WaveformSeek from './WaveformSeek';
 import { useTranslation } from 'react-i18next';
 import { useNavigate } from 'react-router-dom';
 
@@ -18,32 +20,27 @@ function formatTime(seconds: number): string {
 export default function PlayerBar() {
   const { t } = useTranslation();
   const navigate = useNavigate();
-  const { currentTrack, isPlaying, progress, buffered, currentTime, volume, togglePlay, next, previous, seek, setVolume, isQueueVisible, toggleQueue, stop, toggleRepeat, repeatMode, toggleFullscreen } = usePlayerStore();
+  const {
+    currentTrack, isPlaying, currentTime, volume,
+    togglePlay, next, previous, setVolume,
+    stop, toggleRepeat, repeatMode, toggleFullscreen,
+  } = usePlayerStore();
 
   const duration = currentTrack?.duration ?? 0;
   const coverSrc = useMemo(() => currentTrack?.coverArt ? buildCoverArtUrl(currentTrack.coverArt, 128) : '', [currentTrack?.coverArt]);
   const coverKey = currentTrack?.coverArt ? coverArtCacheKey(currentTrack.coverArt, 128) : '';
 
-  const handleSeek = useCallback((e: React.ChangeEvent<HTMLInputElement>) => {
-    seek(parseFloat(e.target.value));
-  }, [seek]);
-
   const handleVolume = useCallback((e: React.ChangeEvent<HTMLInputElement>) => {
     setVolume(parseFloat(e.target.value));
   }, [setVolume]);
 
-  const pct = progress * 100;
-  const buf = Math.max(pct, buffered * 100);
-  const progressStyle = {
-    background: `linear-gradient(to right, var(--ctp-mauve) ${pct}%, var(--ctp-overlay0) ${pct}%, var(--ctp-overlay0) ${buf}%, var(--ctp-surface2) ${buf}%)`,
-  };
-
   const volumeStyle = {
     background: `linear-gradient(to right, var(--ctp-mauve) ${volume * 100}%, var(--ctp-surface2) ${volume * 100}%)`,
   };
 
   return (
     <footer className="player-bar" role="region" aria-label={t('player.regionLabel')}>
+
       {/* Track Info */}
       <div className="player-track-info">
         <div
@@ -89,88 +86,69 @@ export default function PlayerBar() {
         </div>
       </div>
 
-      {/* Controls + Progress */}
-      <div className="player-controls">
-        <div className="player-buttons">
-          <button className="player-btn" onClick={stop} aria-label={t('player.stop')} data-tooltip={t('player.stop')}>
-            <Square size={16} fill="currentColor" />
-          </button>
-          
-          <button className="player-btn" onClick={previous} aria-label={t('player.prev')} data-tooltip={t('player.prev')}>
-            <SkipBack size={20} />
-          </button>
-
-          <button
-            className="player-btn player-btn-primary"
-            onClick={togglePlay}
-            aria-label={isPlaying ? t('player.pause') : t('player.play')}
-            data-tooltip={isPlaying ? t('player.pause') : t('player.play')}
-          >
-            {isPlaying ? <Pause size={22} /> : <Play size={22} fill="currentColor" />}
-          </button>
-
-          <button className="player-btn" onClick={next} aria-label={t('player.next')} data-tooltip={t('player.next')}>
-            <SkipForward size={20} />
-          </button>
-
-          <button 
-            className="player-btn" 
-            onClick={toggleRepeat} 
-            aria-label={t('player.repeat')} 
-            data-tooltip={`${t('player.repeat')}: ${repeatMode === 'off' ? t('player.repeatOff') : repeatMode === 'all' ? t('player.repeatAll') : t('player.repeatOne')}`}
-            style={{ color: repeatMode !== 'off' ? 'var(--accent)' : 'inherit' }}
-          >
-            {repeatMode === 'one' ? <Repeat1 size={18} /> : <Repeat size={18} />}
-          </button>
-        </div>
-
-        <div className="player-progress">
-          <span className="player-time">{formatTime(currentTime)}</span>
-          <div className="player-progress-bar">
-            <input
-              type="range"
-              id="player-seek"
-              min={0}
-              max={1}
-              step={0.001}
-              value={progress}
-              onChange={handleSeek}
-              style={progressStyle}
-              aria-label={t('player.progress')}
-            />
-          </div>
-          <span className="player-time">{formatTime(duration)}</span>
-        </div>
-      </div>
-
-      {/* Volume + Connection */}
-      <div className="player-right">
-        <div className="volume-control" aria-label={t('player.volume')}>
-          {volume === 0 ? <VolumeX size={16} /> : <Volume2 size={16} />}
-          <input
-            type="range"
-            id="player-volume"
-            min={0}
-            max={1}
-            step={0.01}
-            value={volume}
-            onChange={handleVolume}
-            style={volumeStyle}
-            aria-label={t('player.volume')}
-          />
-        </div>
-
-
-        <button 
-          className="player-btn" 
-          onClick={toggleQueue} 
-          aria-label={t('player.toggleQueue')} 
-          data-tooltip={t('player.toggleQueue')}
-          style={{ marginLeft: 'var(--space-3)', color: isQueueVisible ? 'var(--accent)' : 'var(--text-secondary)' }}
+      {/* Transport Controls */}
+      <div className="player-buttons">
+        <button className="player-btn player-btn-sm" onClick={stop} aria-label={t('player.stop')} data-tooltip={t('player.stop')}>
+          <Square size={14} fill="currentColor" />
+        </button>
+        <button className="player-btn" onClick={previous} aria-label={t('player.prev')} data-tooltip={t('player.prev')}>
+          <SkipBack size={19} />
+        </button>
+        <button
+          className="player-btn player-btn-primary"
+          onClick={togglePlay}
+          aria-label={isPlaying ? t('player.pause') : t('player.play')}
+          data-tooltip={isPlaying ? t('player.pause') : t('player.play')}
         >
-          <List size={18} />
+          {isPlaying ? <Pause size={22} /> : <Play size={22} fill="currentColor" />}
+        </button>
+        <button className="player-btn" onClick={next} aria-label={t('player.next')} data-tooltip={t('player.next')}>
+          <SkipForward size={19} />
+        </button>
+        <button
+          className="player-btn player-btn-sm"
+          onClick={toggleRepeat}
+          aria-label={t('player.repeat')}
+          data-tooltip={`${t('player.repeat')}: ${repeatMode === 'off' ? t('player.repeatOff') : repeatMode === 'all' ? t('player.repeatAll') : t('player.repeatOne')}`}
+          style={{ color: repeatMode !== 'off' ? 'var(--accent)' : undefined }}
+        >
+          {repeatMode === 'one' ? <Repeat1 size={14} /> : <Repeat size={14} />}
         </button>
       </div>
+
+      {/* Waveform Seekbar */}
+      <div className="player-waveform-section">
+        <span className="player-time">{formatTime(currentTime)}</span>
+        <div className="player-waveform-wrap">
+          <WaveformSeek trackId={currentTrack?.id} />
+        </div>
+        <span className="player-time">{formatTime(duration)}</span>
+      </div>
+
+      {/* Volume */}
+      <div className="player-volume-section">
+        <button
+          className="player-btn player-btn-sm"
+          onClick={() => setVolume(volume === 0 ? 0.7 : 0)}
+          aria-label={t('player.volume')}
+          style={{ color: 'var(--text-muted)', flexShrink: 0 }}
+        >
+          {volume === 0 ? <VolumeX size={16} /> : <Volume2 size={16} />}
+        </button>
+        <input
+          type="range"
+          id="player-volume"
+          min={0}
+          max={1}
+          step={0.01}
+          value={volume}
+          onChange={handleVolume}
+          style={volumeStyle}
+          aria-label={t('player.volume')}
+          className="player-volume-slider"
+        />
+      </div>
+
     </footer>
   );
 }

src/components/QueuePanel.tsx

@@ -110,6 +110,10 @@ function LoadPlaylistModal({ onClose, onLoad }: { onClose: () => void, onLoad: (
   );
 }
 
+// Module-level fallback for fromIdx — survives the dragend-before-drop race on
+// macOS WKWebView AND the dataTransfer.getData('') bug on Windows WebView2.
+let _dragFromIdx: number | null = null;
+
 export default function QueuePanel() {
   const { t } = useTranslation();
   const navigate = useNavigate();
@@ -154,10 +158,9 @@ export default function QueuePanel() {
   const onDragStart = (e: React.DragEvent, index: number) => {
     isDraggingInternalRef.current = true;
     draggedIdxRef.current = index;
+    _dragFromIdx = index;
     setDraggedIdx(index);
     e.dataTransfer.effectAllowed = 'move';
-    // Store index in dataTransfer too — on macOS WKWebView dragend fires before
-    // drop, so the ref will already be null; dataTransfer survives that race.
     e.dataTransfer.setData('text/plain', JSON.stringify({ type: 'queue_reorder', index }));
   };
 
@@ -179,6 +182,9 @@ export default function QueuePanel() {
     isDraggingInternalRef.current = false;
     draggedIdxRef.current = null;
     dragOverIdxRef.current = null;
+    // _dragFromIdx intentionally NOT cleared here — drop fires after dragend on
+    // macOS WKWebView, so we need the value to survive into onDropQueue.
+    // It is cleared in onDropQueue after use instead.
   };
 
   const onDropQueue = async (e: React.DragEvent) => {
@@ -197,9 +203,11 @@ export default function QueuePanel() {
       if (raw) parsedData = JSON.parse(raw);
     } catch { /* ignore */ }
 
-    if (parsedData?.type === 'queue_reorder') {
-      // fromIdx: always reliable from dataTransfer (set during dragstart)
-      const fromIdx: number = parsedData.index;
+    if (parsedData?.type === 'queue_reorder' || _dragFromIdx !== null) {
+      // fromIdx: prefer dataTransfer value; fall back to module-level var for
+      // Windows WebView2 where getData() can return '' in the drop handler.
+      const fromIdx: number = parsedData?.index ?? _dragFromIdx!;
+      _dragFromIdx = null;
 
       // toIdx: calculate from drop coordinates — avoids all ref timing issues.
       // Works even when dragend fires before drop (macOS WKWebView / Windows WebView2).
@@ -220,6 +228,7 @@ export default function QueuePanel() {
     }
 
     // External drop (song / album dragged from elsewhere in the app)
+    _dragFromIdx = null;
     if (!parsedData) return;
     if (parsedData.type === 'song') {
       enqueue([parsedData.track]);

src/components/Sidebar.tsx

@@ -72,20 +72,25 @@ export default function Sidebar({
 
   useEffect(() => {
     let cancelled = false;
-    const timer = setTimeout(async () => {
+
+    const check = async () => {
       try {
         const res = await fetch('https://api.github.com/repos/Psychotoxical/psysonic/releases/latest');
         if (!res.ok) return;
         const data = await res.json();
         const tag: string = data.tag_name ?? '';
         if (!cancelled && tag && isNewer(tag, appVersion)) {
-          setLatestVersion(tag.startsWith('v') ? tag : `v${tag}`);
+          setLatestVersion(tag.replace(/^v/i, ''));
         }
       } catch {
         // network unavailable — silently skip
       }
-    }, 1500);
-    return () => { cancelled = true; clearTimeout(timer); };
+    };
+
+    const initial = setTimeout(check, 1500);
+    const interval = setInterval(check, 10 * 60 * 1000); // every 10 minutes
+
+    return () => { cancelled = true; clearTimeout(initial); clearInterval(interval); };
   }, []);
 
   return (

src/components/VisualizerCanvas.tsx

@@ -0,0 +1,130 @@
+import { useEffect, useRef } from 'react';
+import butterchurn from 'butterchurn';
+import butterchurnPresets from 'butterchurn-presets';
+import { buildStreamUrl } from '../api/subsonic';
+import { usePlayerStore } from '../store/playerStore';
+
+interface Props {
+  trackId: string;
+  nextPresetTrigger: number;
+  onPresetName: (name: string) => void;
+}
+
+export default function VisualizerCanvas({ trackId, nextPresetTrigger, onPresetName }: Props) {
+  const canvasRef = useRef<HTMLCanvasElement>(null);
+  const vizRef = useRef<ReturnType<typeof butterchurn.createVisualizer> | null>(null);
+  const audioRef = useRef<HTMLAudioElement | null>(null);
+  const audioCtxRef = useRef<AudioContext | null>(null);
+  const rafRef = useRef<number>(0);
+  const presetNamesRef = useRef<string[]>([]);
+  const presetMapRef = useRef<Record<string, unknown>>({});
+  const presetIdxRef = useRef(0);
+
+  // ── Init audio analysis + butterchurn ──────────────────────────────────────
+  useEffect(() => {
+    const canvas = canvasRef.current;
+    if (!canvas) return;
+
+    // Hidden audio element — routed through Web Audio for analysis only.
+    // NOT connected to AudioDestinationNode → completely silent.
+    // The Rust/rodio engine plays the actual audio.
+    const streamUrl = buildStreamUrl(trackId);
+    const audio = new Audio(streamUrl);
+    audio.crossOrigin = 'anonymous';
+    audioRef.current = audio;
+
+    const ctx = new AudioContext();
+    audioCtxRef.current = ctx;
+    const source = ctx.createMediaElementSource(audio);
+    // Intentionally no: source.connect(ctx.destination)
+
+    // Size canvas to fill its container
+    const rect = canvas.getBoundingClientRect();
+    const w = rect.width || window.innerWidth;
+    const h = rect.height || window.innerHeight;
+    canvas.width = w * (window.devicePixelRatio || 1);
+    canvas.height = h * (window.devicePixelRatio || 1);
+
+    const visualizer = butterchurn.createVisualizer(ctx, canvas, {
+      width: canvas.width,
+      height: canvas.height,
+      pixelRatio: window.devicePixelRatio || 1,
+    });
+    vizRef.current = visualizer;
+    visualizer.connectAudio(source);
+
+    // Presets
+    const presets = butterchurnPresets.getPresets();
+    const names = Object.keys(presets);
+    presetNamesRef.current = names;
+    presetMapRef.current = presets;
+    const startIdx = Math.floor(Math.random() * names.length);
+    presetIdxRef.current = startIdx;
+    visualizer.loadPreset(presets[names[startIdx]], 2.0);
+    onPresetName(names[startIdx]);
+
+    // Sync position + play state with main player
+    const { currentTime, isPlaying } = usePlayerStore.getState();
+    audio.currentTime = currentTime;
+    if (isPlaying) audio.play().catch(() => {});
+
+    // Render loop
+    const render = () => {
+      rafRef.current = requestAnimationFrame(render);
+      visualizer.render();
+    };
+    rafRef.current = requestAnimationFrame(render);
+
+    // Keep canvas sized to window
+    const onResize = () => {
+      const r = canvas.getBoundingClientRect();
+      const dpr = window.devicePixelRatio || 1;
+      canvas.width = r.width * dpr;
+      canvas.height = r.height * dpr;
+      visualizer.setRendererSize(canvas.width, canvas.height);
+    };
+    window.addEventListener('resize', onResize);
+
+    // Sync play/pause with main player
+    const unsubscribe = usePlayerStore.subscribe(state => {
+      const a = audioRef.current;
+      const c = audioCtxRef.current;
+      if (!a || !c) return;
+      if (state.isPlaying) {
+        c.resume();
+        a.play().catch(() => {});
+      } else {
+        a.pause();
+      }
+    });
+
+    return () => {
+      cancelAnimationFrame(rafRef.current);
+      window.removeEventListener('resize', onResize);
+      unsubscribe();
+      audio.pause();
+      audio.src = '';
+      ctx.close();
+      vizRef.current = null;
+    };
+  }, [trackId]); // re-init on track change
+
+  // ── Next preset ────────────────────────────────────────────────────────────
+  useEffect(() => {
+    if (!nextPresetTrigger) return;
+    const viz = vizRef.current;
+    const names = presetNamesRef.current;
+    if (!viz || names.length === 0) return;
+    const next = (presetIdxRef.current + 1) % names.length;
+    presetIdxRef.current = next;
+    viz.loadPreset(presetMapRef.current[names[next]], 2.0);
+    onPresetName(names[next]);
+  }, [nextPresetTrigger]);
+
+  return (
+    <canvas
+      ref={canvasRef}
+      style={{ position: 'absolute', inset: 0, width: '100%', height: '100%', display: 'block' }}
+    />
+  );
+}

src/components/WaveformSeek.tsx

@@ -0,0 +1,180 @@
+import React, { useEffect, useRef } from 'react';
+import { usePlayerStore } from '../store/playerStore';
+
+const BAR_COUNT = 500;
+
+function hashStr(str: string): number {
+  let h = 0x811c9dc5;
+  for (let i = 0; i < str.length; i++) {
+    h = (h ^ str.charCodeAt(i)) >>> 0;
+    h = Math.imul(h, 0x01000193) >>> 0;
+  }
+  return h;
+}
+
+function makeHeights(trackId: string): Float32Array {
+  let s = hashStr(trackId);
+  const h = new Float32Array(BAR_COUNT);
+  for (let i = 0; i < BAR_COUNT; i++) {
+    s = (Math.imul(s, 1664525) + 1013904223) >>> 0;
+    h[i] = s / 0xffffffff;
+  }
+  // Smooth for an organic look
+  for (let pass = 0; pass < 5; pass++) {
+    for (let i = 1; i < BAR_COUNT - 1; i++) {
+      h[i] = h[i - 1] * 0.25 + h[i] * 0.5 + h[i + 1] * 0.25;
+    }
+  }
+  // Normalize to [0.12, 1.0]
+  let max = 0;
+  for (let i = 0; i < BAR_COUNT; i++) if (h[i] > max) max = h[i];
+  if (max > 0) {
+    for (let i = 0; i < BAR_COUNT; i++) h[i] = 0.12 + (h[i] / max) * 0.88;
+  }
+  return h;
+}
+
+function drawWaveform(
+  canvas: HTMLCanvasElement,
+  heights: Float32Array | null,
+  progress: number,
+  buffered: number,
+) {
+  const ctx = canvas.getContext('2d');
+  if (!ctx) return;
+
+  const rect = canvas.getBoundingClientRect();
+  const w = rect.width || canvas.clientWidth;
+  const h = rect.height || canvas.clientHeight;
+  if (w === 0 || h === 0) return;
+
+  const dpr = window.devicePixelRatio || 1;
+  const pw = Math.round(w * dpr);
+  const ph = Math.round(h * dpr);
+  if (canvas.width !== pw || canvas.height !== ph) {
+    canvas.width = pw;
+    canvas.height = ph;
+  }
+  ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
+  ctx.clearRect(0, 0, w, h);
+
+  const style = getComputedStyle(document.documentElement);
+  const colorBlue     = style.getPropertyValue('--ctp-blue').trim()     || '#89b4fa';
+  const colorMauve    = style.getPropertyValue('--ctp-mauve').trim()    || '#cba6f7';
+  const colorBuffered = style.getPropertyValue('--ctp-overlay0').trim() || '#6c7086';
+  const colorUnplayed = style.getPropertyValue('--ctp-surface1').trim() || '#313244';
+
+  if (!heights) {
+    ctx.globalAlpha = 0.3;
+    ctx.fillStyle = colorUnplayed;
+    ctx.fillRect(0, (h - 2) / 2, w, 2);
+    ctx.globalAlpha = 1;
+    return;
+  }
+
+  // Use fractional x positions so adjacent bars share exact pixel boundaries — no gaps.
+  const x1Of = (i: number) => (i / BAR_COUNT) * w;
+  const x2Of = (i: number) => ((i + 1) / BAR_COUNT) * w;
+
+  // Pass 1 — unplayed (dim)
+  ctx.globalAlpha = 0.28;
+  ctx.fillStyle = colorUnplayed;
+  for (let i = 0; i < BAR_COUNT; i++) {
+    if (i / BAR_COUNT < buffered) continue;
+    const barH = Math.max(1, heights[i] * h);
+    const x = x1Of(i);
+    ctx.fillRect(x, (h - barH) / 2, x2Of(i) - x, barH);
+  }
+
+  // Pass 2 — buffered (slightly brighter)
+  ctx.globalAlpha = 0.45;
+  ctx.fillStyle = colorBuffered;
+  for (let i = 0; i < BAR_COUNT; i++) {
+    const frac = i / BAR_COUNT;
+    if (frac < progress || frac >= buffered) continue;
+    const barH = Math.max(1, heights[i] * h);
+    const x = x1Of(i);
+    ctx.fillRect(x, (h - barH) / 2, x2Of(i) - x, barH);
+  }
+
+  // Pass 3 — played (gradient + glow)
+  if (progress > 0) {
+    const grad = ctx.createLinearGradient(0, 0, progress * w, 0);
+    grad.addColorStop(0, colorBlue);
+    grad.addColorStop(1, colorMauve);
+    ctx.globalAlpha = 1;
+    ctx.fillStyle = grad;
+    ctx.shadowColor = colorMauve;
+    ctx.shadowBlur = 5;
+    for (let i = 0; i < BAR_COUNT; i++) {
+      if (i / BAR_COUNT >= progress) break;
+      const barH = Math.max(1, heights[i] * h);
+      const x = x1Of(i);
+      ctx.fillRect(x, (h - barH) / 2, x2Of(i) - x, barH);
+    }
+    ctx.shadowBlur = 0;
+  }
+
+  ctx.globalAlpha = 1;
+}
+
+interface Props {
+  trackId: string | undefined;
+}
+
+export default function WaveformSeek({ trackId }: Props) {
+  const canvasRef   = useRef<HTMLCanvasElement>(null);
+  const heightsRef  = useRef<Float32Array | null>(null);
+  const progressRef = useRef(0);
+  const bufferedRef = useRef(0);
+  const isDragging  = useRef(false);
+
+  const progress = usePlayerStore(s => s.progress);
+  const buffered = usePlayerStore(s => s.buffered);
+  const seek     = usePlayerStore(s => s.seek);
+
+  progressRef.current = progress;
+  bufferedRef.current = buffered;
+
+  useEffect(() => {
+    heightsRef.current = trackId ? makeHeights(trackId) : null;
+  }, [trackId]);
+
+  useEffect(() => {
+    if (canvasRef.current) {
+      drawWaveform(canvasRef.current, heightsRef.current, progress, buffered);
+    }
+  }, [progress, buffered, trackId]);
+
+  useEffect(() => {
+    const canvas = canvasRef.current;
+    if (!canvas) return;
+    const ro = new ResizeObserver(() => {
+      drawWaveform(canvas, heightsRef.current, progressRef.current, bufferedRef.current);
+    });
+    ro.observe(canvas);
+    return () => ro.disconnect();
+  }, []);
+
+  const seekFromX = (clientX: number) => {
+    const canvas = canvasRef.current;
+    if (!canvas || !trackId) return;
+    const rect = canvas.getBoundingClientRect();
+    seek(Math.max(0, Math.min(1, (clientX - rect.left) / rect.width)));
+  };
+
+  useEffect(() => {
+    const up = () => { isDragging.current = false; };
+    window.addEventListener('mouseup', up);
+    return () => window.removeEventListener('mouseup', up);
+  }, []);
+
+  return (
+    <canvas
+      ref={canvasRef}
+      style={{ width: '100%', height: '24px', cursor: trackId ? 'pointer' : 'default', display: 'block' }}
+      onMouseDown={e => { isDragging.current = true; seekFromX(e.clientX); }}
+      onMouseMove={e => { if (isDragging.current) seekFromX(e.clientX); }}
+    />
+  );
+}