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Frank Stellmacher
5b89051817
The high-frequency PlaybackProgressSnapshot channel — type, mutable snapshot, listener Set, emit/get/subscribe — moves into a dedicated src/store/playbackProgress.ts. playerStore re-exports the public 3 (getPlaybackProgressSnapshot, subscribePlaybackProgress, the type) so the 5+ external callers (PlayerBar, FullscreenPlayer, WaveformSeek, LyricsPane, MobilePlayerView, TauriEventBridge) keep their existing imports. Direct unit tests pin the delta short-circuit (`currentTime <0.005`, `progress/buffered <0.0002`) that keeps idle CPU bounded. The end-to-end Tauri-event drive path remains covered by the existing playerStore.progress characterization test (unchanged). playerStore 3516 → 3490 LOC.