Added comprehensive test coverage for URL validation:
- Test for invalid URL formats (missing /i/, missing space ID, malformed URLs)
- Test for twitter.com domain support (in addition to x.com)
Updated validator implementation:
- Extended regex pattern to accept both x.com and twitter.com domains
- Updated group capture index to account for domain alternation
All validator tests passing (3/3).
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Co-Authored-By: Claude <noreply@anthropic.com>