Potential fixes for 3 code quality findings

[nogeenhenk]

This PR applies 3/4 suggestions from code quality AI findings. 1 suggestion was skipped to avoid creating conflicts.

[coveralls]

coverage: 18.397% (-0.007%) from 18.404%
when pulling 30ee50b on ai-findings-autofix/src-usersdialog.cpp
into 94bbe81 on main.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 24.02%. Comparing base (94bbe81) to head (30ee50b).
⚠️ Report is 5 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/usersdialog.cpp	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #822      +/-   ##
==========================================
- Coverage   24.03%   24.02%   -0.02%     
==========================================
  Files          38       38              
  Lines        3016     3018       +2     
==========================================
  Hits          725      725              
- Misses       2291     2293       +2     

Flag	Coverage Δ
qtpass	24.02% <0.00%> (-0.02%)	⬇️

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