wangdl af58ec7374 test: add extract_epub_chapter_texts + strip_html unit tests (DOC-FULL-024)
- 7 strip_html tests: remove tags, collapse whitespace, nested tags,
  self-closing tags, attributes, empty input, plain text
- 4 extract_epub_chapter_texts tests: chapters with HTML, empty chapter
  filtered, all empty, plain text preserved
- epub_with_chapter_text helper builds EPUB with custom chapter content

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-06-18 13:35:03 +08:00
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