Unpin Makie and fix tests

[jkrumbiegel]

Instead of just changing all the tested metadata values to the same values given figure size (because they don't reflect dpi) I've added tests for both logical and real image size everywhere.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 32.09%. Comparing base (a2ce1e4) to head (ee30627).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #281      +/-   ##
==========================================
+ Coverage   32.07%   32.09%   +0.02%     
==========================================
  Files          57       57              
  Lines        2672     2673       +1     
==========================================
+ Hits          857      858       +1     
  Misses       1815     1815              

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