Add two new tests for label field functionality:
- label_fields_imported_as_label_category_coords: Verifies that
high-cardinality fields (>20 distinct values) are classified as
Label kind, default to accepted, and are stored as category coords
- label_category_defaults_to_none_axis: Verifies that label categories
default to Axis::None in the active view
Co-Authored-By: fiddlerwoaroof/git-smart-commit (unsloth/Qwen3.5-35B-A3B-GGUF:Q5_K_M)