GEOPY-2775: DCIP 2D crash on line ID selection

[domfournier]

GEOPY-2775 - DCIP 2D crash on line ID selection

[Copilot]

Pull request overview

This PR adjusts 2D mesh construction and nested-simulation active-cell selection to be more robust in edge cases encountered in GEOPY-2775.

Changes:

• Round min/max extents passed into mesh_builder_xyz during drape-model mesh creation to avoid floor/int rounding edge cases.
• Update DCIP-2D nested simulation mapping to derive active mesh parts from source/electrode locations rather than assuming line IDs match mesh part numbering.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
simpeg_drivers/utils/utils.py	Computes floored/ceiled distance/elevation limits before building the tensor mesh for drape-model generation.
simpeg_drivers/utils/nested.py	Determines active mesh parts for DCIP-2D via cell lookup on cell_centers_x and mesh.parts, removing the sequential-ID assumption.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.83%. Comparing base (faf805d) to head (14c1421).
⚠️ Report is 9 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #366      +/-   ##
===========================================
- Coverage    89.85%   89.83%   -0.02%     
===========================================
  Files          125      125              
  Lines         6435     6437       +2     
  Branches       794      794              
===========================================
+ Hits          5782     5783       +1     
  Misses         449      449              
- Partials       204      205       +1     

Files with missing lines	Coverage Δ
simpeg_drivers/utils/nested.py	95.43% <100.00%> (+0.02%)	⬆️
simpeg_drivers/utils/utils.py	70.58% <100.00%> (+0.10%)	⬆️

... and 1 file with indirect coverage changes

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