feat: adaptive bitrate support, engine improvements, demo updates, and electron preload

scripts/pack-html.cjs

@@ -28,7 +28,7 @@ execSync('npx vite build', { cwd: root, stdio: 'inherit' })
 
 // 3. Copy public assets into dist
 console.log('📁 Copying assets...')
-;['videos', 'audio', 'images', 'scenes', 'subtitles'].forEach((dir) => {
+;['audio', 'images', 'scenes', 'subtitles'].forEach((dir) => {
   const src = path.join(root, 'public', dir)
   const dest = path.join(dist, dir)
   if (fs.existsSync(src)) {