🧪 Add test for VAL-SYN-007 (Duplicate Definitions)

[Salah-Sal]

This PR introduces a new test file tests/test_validation_syn_007.py to verify the functionality of the VAL-SYN-007 validation rule, which detects duplicate definitions across synsets. The test suite includes cases for detecting duplicates, verifying clean data, and checking scoped validation (filtering by lexicon ID). Additionally, src/wordnet_editor/importer.py was updated to move wn imports to the top level, resolving ModuleNotFoundError issues encountered during the test run.

Coverage

• Positive Case: Creates two synsets with identical definitions and asserts that VAL-SYN-007 is raised with the correct count.
• Negative Case: Creates two synsets with distinct definitions and asserts no warning is raised.
• Filtered Case: Verifies that validation respects the lexicon_id filter, counting duplicates only within the specified scope.

Result

• Confirmed that VAL-SYN-007 correctly identifies duplicates.
• All 116 tests passed.

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PR created automatically by Jules for task 13102920572237085417 started by @Salah-Sal

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