put geometry on the COM

[PythonFZ]

• add a test

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 12.50000% with 28 lines in your changes missing coverage. Please review.

Project coverage is 50.03%. Comparing base (505fd0f) to head (8f1d80e).

Files with missing lines	Patch %	Lines
tests/test_geometries.py	16.00%	21 Missing ⚠️
zndraw/tasks/__init__.py	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #759      +/-   ##
==========================================
- Coverage   50.25%   50.03%   -0.22%     
==========================================
  Files          38       38              
  Lines        2754     2786      +32     
==========================================
+ Hits         1384     1394      +10     
- Misses       1370     1392      +22     

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