Add optional USB DAC routing for high-res playback - #142
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Routes playback to a connected USB audio device when the new "Route to USB DAC" preference is enabled, so high-res files reach the DAC without going through the default output. Applies on the next prepare; hot-plug mid-track is left for a follow-up. MediaPlayer.setPreferredDevice and ExoPlayer.setPreferredAudioDevice are guarded behind API 28+. UsbDacHelper also reads the source sample rate via MediaExtractor for diagnostic logging. Refs paroj#141.
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Routes playback to a connected USB audio device when the new "Route to USB DAC" preference is enabled, so high-res files reach the DAC without going through the default output. Applies on the next prepare; hot-plug mid-track is left for a follow-up.
MediaPlayer.setPreferredDevice and ExoPlayer.setPreferredAudioDevice are guarded behind API 28+. UsbDacHelper also reads the source sample rate via MediaExtractor for diagnostic logging.
Refs #141.