Support case-insensitive morphology paths and extensions

[ilkilic]

Fix case-sensitive file lookup on Linux by resolving morphology paths case-insensitively and normalizing extensions to lowercase.

Adds regression tests to ensure consistent behavior across platforms.

[codecov]

Codecov Report

❌ Patch coverage is 98.00000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
bluecellulab/cell/morphio_wrapper.py	95.83%	1 Missing ⚠️

Files with missing lines	Coverage Δ
tests/test_cell/test_morphology_wrapper.py	96.93% <100.00%> (+0.33%)	⬆️
bluecellulab/cell/morphio_wrapper.py	97.90% <95.83%> (-0.30%)	⬇️

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[darshanmandge]

Thanks for fixing it!