Improve plots

[PythonFZ]

• add step to force correlation
• improve dark mode

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 15.38462% with 11 lines in your changes missing coverage. Please review.

Project coverage is 50.21%. Comparing base (59b737c) to head (ac5d66f).

Files with missing lines	Patch %	Lines
zndraw/analyse/__init__.py	11.11%	8 Missing ⚠️
zndraw/utils.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #756      +/-   ##
==========================================
- Coverage   50.61%   50.21%   -0.41%     
==========================================
  Files          38       38              
  Lines        2742     2754      +12     
==========================================
- Hits         1388     1383       -5     
- Misses       1354     1371      +17     

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