Various small improvements and bugfixes

[PhrozenByte]

See individual commits

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.03%. Comparing base (26c6af2) to head (c539338).
Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
src/desktop_notifier/backends/dbus.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #204      +/-   ##
==========================================
- Coverage   85.13%   85.03%   -0.11%     
==========================================
  Files          10       10              
  Lines         895      902       +7     
==========================================
+ Hits          762      767       +5     
- Misses        133      135       +2     

Flag	Coverage Δ
pytest	85.03% <66.66%> (-0.11%)	⬇️

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[samschott]

Thank you!