Fix author_dates_match comparing only year, ignoring month/day

[soumojit-D48]

Closes #13065

fix
Fixes author_dates_match() returning True for authors with different full dates that happen to share the same year. The function was only comparing 4-digit years, ignoring month/day. A bare year like "1650" still matches any full date in that year — the fix only rejects a match when both records have fully specified dates with genuinely different content.
Technical
After extracting years from both date strings and finding they match, the fix adds a check: if both original strings contain more than just the year (e.g. "01 December 1650" not "1650"), and the full strings differ, return False. This preserves the imprecise-date fallback while catching real mismatches.

Testing

• test_author_dates_match() — all existing assertions still pass
• The previously-broken assertion now correctly expects False instead of True
• Run: pytest openlibrary/tests/catalog/test_utils.py

[openlibrary-bot]

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[soumojit-D48]

@mekarpeles pls review this pr!!!