test: add unit tests for utils/_io.py (lblsave)#1862
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Summary
lblsaveinlabelme/utils/_io.pywas the only utility function with no dedicated test file. This PR addstests/unit/utils/_io_test.pywith 4 tests covering its full behavior.Tests Added
test_lblsave_valid_uint8_labels— labels in[0, 254]range are saved as a P-mode PNG with a colormaptest_lblsave_adds_png_extension— filename without.pngextension gets.pngappended automaticallytest_lblsave_invalid_labels_raises—lbl.max() >= 255raisesValueErrortest_lblsave_negative_one_labels_ok—lbl.min() == -1withlbl.max() < 255saves successfullyAll 4 tests pass. No behavior changes — tests only.