Previously, the audio session was initialized immediately when the app launched, causing audio from other apps (like Music) to stop even when no video was playing in Yattee.
Changes:
- Remove audio session initialization from AppDelegate launch
- Remove audio session setup from MPVClient initialization
- Update setAudioSessionActive() to configure audio session category before activation
The audio session is now lazily initialized only when playback actually starts:
- For MPV backend: triggered by FILE_LOADED, PLAYBACK_RESTART, AUDIO_RECONFIG events
- For AVPlayer backend: triggered when play() is called
This allows music from other apps to continue playing until a video is actually played in Yattee.
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