bugfix: use xform in json as defacto xform

[xgui3783]

bugfix: region model to_model simplification

[codecov-commenter]

Codecov Report

Merging #179 (edb53c8) into main (7730920) will decrease coverage by 0.10%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##             main     #179      +/-   ##
==========================================
- Coverage   63.54%   63.43%   -0.11%     
==========================================
  Files          32       32              
  Lines        4457     4471      +14     
==========================================
+ Hits         2832     2836       +4     
- Misses       1625     1635      +10     

Impacted Files	Coverage Δ
siibra/volumes/volume.py	76.30% <72.72%> (-0.87%)	⬇️
siibra/core/region.py	72.16% <100.00%> (ø)
siibra/retrieval/requests.py	80.26% <0.00%> (-2.64%)	⬇️

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