Show interactive spin arrows

[rozyczko]

Magnetism vector representation and marker extraction:

• Added magnetic_vector_for_layer(magnetism), which computes a detailed dictionary describing a layer's in-plane magnetic moment, including both parameter and physical angles, magnitude, and channel components. This ensures all arrow visualizations use a single, well-defined convention.
• Introduced Project.magnetic_layer_markers_for_model_at_index(index), which returns a list of marker dictionaries for each magnetic layer in a model, including their depth extents, moment vectors, and a boolean indicating if the moment is significant. This method handles stack order, repeat expansion, and corrects for profile padding and reversal, ensuring accurate placement and annotation of magnetic layers.

[codecov]

Codecov Report

❌ Patch coverage is 97.22222% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 94.59%. Comparing base (ad7d255) to head (bf5c4e4).

Files with missing lines	Patch %	Lines
src/easyreflectometry/project.py	97.22%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #415      +/-   ##
===========================================
+ Coverage    94.57%   94.59%   +0.01%     
===========================================
  Files           54       54              
  Lines         5515     5551      +36     
===========================================
+ Hits          5216     5251      +35     
- Misses         299      300       +1     

Flag	Coverage Δ
integration	38.13% <8.33%> (-0.20%)	⬇️
unittests	94.59% <97.22%> (+0.01%)	⬆️

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Files with missing lines	Coverage Δ
src/easyreflectometry/project.py	94.46% <97.22%> (+0.09%)	⬆️

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