fix: normalize hyphens in kebabcase

[eeshsaxena]

Description

This pull request:

• fixes @stdlib/string/base/kebabcase to normalize hyphens. The RE_SPECIAL regular expression omitted the hyphen, unlike the equivalent snakecase, camelcase, and constantcase implementations. As a result, inputs mixing hyphens and whitespace produced runs of hyphens: kebabcase( 'foo - bar' ) returned 'foo---bar' instead of 'foo-bar', and 'foo--bar' was left unchanged. Adding the hyphen to RE_SPECIAL makes hyphens behave as word separators and collapse consistently with the other case utilities. The non-base @stdlib/string/kebabcase delegates to this implementation, so it is fixed as well.

Related Issues

None.

Questions

No.

Other

All existing kebabcase tests still pass; added regression tests for 'foo - bar' and 'foo--bar'.

Checklist

• Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• Yes
• No

If you answered "yes" above, how did you use AI assistance?

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

Disclosure

AI assistance was used only to cross-verify my work for mistakes; the fix and the regression tests were authored by me.

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