- Document the eda_* import columns in docs/usage/import_export.md: the flat form and its short
aliases, and the nested eda_info.* form used by the CSV/JSON export and the shipped
part_import_example.csv.
- Add EntityImporterTest coverage locking in that BOTH the nested eda_info.* form and the flat
form import the EDA fields correctly (the nested form already worked via the serializer but was
untested, so an export -> re-import round-trip could silently regress).
- Fix the eda_invisible alias: it was a plain key-rename to eda_visibility, so eda_invisible=1
stored visibility=true (made the part visible - the opposite of the name). It is now handled
explicitly and inverted.
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