Static EOF_WATCHDOG_ACTIVE 

static EOF_WATCHDOG_ACTIVE: AtomicBool

Host-side playback_status poll for library playback EOF when the WebView defers its setInterval poll (isUiIdleHeavyCpu — hidden, unfocused, minimized; see syncEnginePlaybackEofWatchdog in audio-engine.js). Throttled background timers can miss EOF for autoplay-next; this thread emits audio-engine-playback-eof on the same loaded && eof rising edge as the UI poll.