test: expanding test coverage for designer and math

[syscordan]

Description

Expanding test coverage for designer/selection.py, designer/part.py, math\bbox.py, math\matrix.py, math\vector.py

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate unit tests.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have added the minimum version decorator to any new backend method implemented.
• I have made sure that the title of my PR follows Conventional commits style (e.g. feat: extrude circle to cylinder)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.60%. Comparing base (38ee044) to head (010dceb).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2061      +/-   ##
==========================================
+ Coverage   92.31%   92.60%   +0.29%     
==========================================
  Files         136      136              
  Lines        9810     9810              
==========================================
+ Hits         9056     9085      +29     
+ Misses        754      725      -29     

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[RyanJWard]

Looks good

[RobPasMue]

LGTM too! Thanks @syscordan