[hluk]

Initialize the miniaudio engine lazily on the first playSound() call instead of at startup. Release the engine once all sounds finish playing.

This avoids holding a persistent PulseAudio/PipeWire connection while idle, which caused ~1-2% background CPU from the audio socket dispatch thread and a spurious "playing audio" status in the desktop environment.

Assisted-by: Claude (Anthropic)

[codecov]

Codecov Report

❌ Patch coverage is 58.69565% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.45%. Comparing base (e9544c1) to head (28a8ef8).

Files with missing lines	Patch %	Lines
src/common/audioplayer.cpp	58.69%	19 Missing ⚠️

❌ Your patch check has failed because the patch coverage (58.69%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3684      +/-   ##
==========================================
- Coverage   74.49%   74.45%   -0.04%     
==========================================
  Files         256      256              
  Lines       37993    38008      +15     
  Branches     5118     5118              
==========================================
- Hits        28303    28299       -4     
- Misses       9690     9709      +19     

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