feat: Rust audio engine, genre mix, queue shuffle, and UX improvements (v1.2.0)

### Audio Engine
- Replace Howler.js with native Rust/rodio backend (src-tauri/src/audio.rs)
- audio_play/pause/resume/stop/seek/set_volume Tauri commands
- Generation counter cancels stale in-flight downloads on skip
- Wall-clock position tracking; audio:ended after 2 ticks near end

### Playback Persistence
- Persist currentTrack, queue, queueIndex, currentTime to localStorage
- Cold-start resume: play + seek to saved position on app restart
- Position priority: server queue > localStorage

### Random Mix
- Genre blacklist: excludeAudiobooks toggle + custom chip-based blacklist
- Clickable genre chips in tracklist to blacklist on the fly
- Super Genre Mix: 9 genres, progressive rendering, Load 10 more
- Promise.allSettled + 45s timeout for large Metal/Rock libraries
- Two-column filter panel at top of page

### Queue & UI
- Shuffle button in queue header (Fisher-Yates, keeps current track at 0)
- LiveSearch arrow key / Enter / Escape keyboard navigation
- Multi-line tooltip support (data-tooltip-wrap attribute)
- Update link uses Tauri shell open() to launch system browser
- Sidebar min-width 180px → 200px (fixes Psysonic title clipping)
- Tooltip z-index fix: main-content z-index:1 over queue panel

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

src/App.tsx

@@ -27,7 +27,7 @@ import SearchResults from './pages/SearchResults';
 import FullscreenPlayer from './components/FullscreenPlayer';
 import ContextMenu from './components/ContextMenu';
 import { useAuthStore } from './store/authStore';
-import { usePlayerStore } from './store/playerStore';
+import { usePlayerStore, initAudioListeners } from './store/playerStore';
 import { useThemeStore } from './store/themeStore';
 
 function RequireAuth({ children }: { children: React.ReactNode }) {
@@ -110,7 +110,7 @@ function AppShell() {
     <div 
       className="app-shell"
       style={{
-        '--sidebar-width': isSidebarCollapsed ? '72px' : 'clamp(180px, 15vw, 220px)',
+        '--sidebar-width': isSidebarCollapsed ? '72px' : 'clamp(200px, 15vw, 220px)',
         '--queue-width': isQueueVisible ? `${queueWidth}px` : '0px'
       } as React.CSSProperties}
       onContextMenu={e => e.preventDefault()}
@@ -223,6 +223,10 @@ export default function App() {
     document.documentElement.setAttribute('data-theme', theme);
   }, [theme]);
 
+  useEffect(() => {
+    return initAudioListeners();
+  }, []);
+
   return (
     <BrowserRouter>
       <TauriEventBridge />