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/App.tsx

@@ -3,6 +3,8 @@ import { BrowserRouter, Routes, Route, Navigate } from 'react-router-dom';
 import { listen } from '@tauri-apps/api/event';
 import { invoke } from '@tauri-apps/api/core';
 import { getCurrentWindow } from '@tauri-apps/api/window';
+import { PanelRight, PanelRightClose } from 'lucide-react';
+import { useTranslation } from 'react-i18next';
 import Sidebar from './components/Sidebar';
 import PlayerBar from './components/PlayerBar';
 import LiveSearch from './components/LiveSearch';
@@ -37,9 +39,11 @@ function RequireAuth({ children }: { children: React.ReactNode }) {
 }
 
 function AppShell() {
+  const { t } = useTranslation();
   const isFullscreenOpen = usePlayerStore(s => s.isFullscreenOpen);
   const toggleFullscreen = usePlayerStore(s => s.toggleFullscreen);
   const isQueueVisible = usePlayerStore(s => s.isQueueVisible);
+  const toggleQueue = usePlayerStore(s => s.toggleQueue);
   const initializeFromServerQueue = usePlayerStore(s => s.initializeFromServerQueue);
   const currentTrack = usePlayerStore(s => s.currentTrack);
   const isPlaying = usePlayerStore(s => s.isPlaying);
@@ -124,6 +128,13 @@ function AppShell() {
           <LiveSearch />
           <div className="spacer" />
           <NowPlayingDropdown />
+          <button
+            className="collapse-btn"
+            onClick={toggleQueue}
+            title={t('player.toggleQueue')}
+          >
+            {isQueueVisible ? <PanelRightClose size={24} /> : <PanelRight size={24} />}
+          </button>
         </header>
         <div className="content-body" style={{ padding: 0 }}>
           <Routes>