Improve macOS DND detection

[hovancik]

closed #1402
closes #1513

[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 15.04%. Comparing base (135c3be) to head (79ab66e).
Report is 7 commits behind head on trunk.

Files with missing lines	Patch %	Lines
app/utils/dndManager.js	16.66%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk    #1540      +/-   ##
==========================================
+ Coverage   14.77%   15.04%   +0.27%     
==========================================
  Files          30       30              
  Lines        1970     1974       +4     
==========================================
+ Hits          291      297       +6     
+ Misses       1679     1677       -2     

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