maintenance: code linting

[adbar]

• handle most security and linter warnings
• remove duplicate code
• sort imports with isort for readability

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.34%. Comparing base (7fd3de6) to head (014c0b6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #130      +/-   ##
==========================================
- Coverage   96.37%   96.34%   -0.04%     
==========================================
  Files          33       33              
  Lines         580      575       -5     
==========================================
- Hits          559      554       -5     
  Misses         21       21              

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