Gapless Playback Optimizasyonu

Sarki Oynatilirken:
  ontimeupdate -> currentTime >= 2s -> preloadNextSong()
                                           |
                                           v
                                    _preloadedNext = {
                                      songId, hls, audioId, ready: true
                                    }

Sarki Bitince:
  audio.onended -> onTrackEnded()
                        |
                        v
                   nextTrack(true)  // fromNaturalEnd=true
                        |
                        v
                   (skip stopCurrentPlayback!)
                        |
                        v
                   playSongFromQueue()
                        |
                        v
                   playHlsStream()
                        |
                        v
                   if (_preloadedNext.ready) {
                     preloadedAudio.play()  // INSTANT!
                     setTimeout(100ms) {
                       cleanup oldHls/oldHowl
                     }
                   }