fix: resolve #174 - fix regex for hyphenated tag names in HTML scanner

[maruthang]

Summary

Fixes #174

Bug: Hyphenated custom element tag names (e.g., <s-c-feature>) were not scanned correctly, causing Vue HTML scan errors.

Root Cause: In nextElementName() in htmlScanner.ts, the regex character class [_:\w-.\d] placed the hyphen between \w and ., making it ambiguous (interpreted as a range rather than a literal hyphen).

Fix: Moved the hyphen to the end of the character class ([_:\w.\d-]) so it is unambiguously treated as a literal hyphen character.

Changes

• src/parser/htmlScanner.ts: Fixed regex in nextElementName() — moved hyphen to end of character class
• src/test/scanner.test.ts: Added 3 regression tests for hyphenated tag names (Vue custom element, self-closing, and with attributes)

Testing

• Added regression tests in src/test/scanner.test.ts that verify correct tokenization of hyphenated element names like s-c-feature, my-component, and el-button
• All 101 existing tests pass