The TXT-to-EPUB segment regex splits on dash dividers (`-{8,}`), which
authors commonly use as in-chapter scene breaks. Each heading-less section
after such a divider was emitted as its own chapter — a numbered paragraph
fallback chapter, or a chapter titled after a stray sentence — flooding the
generated TOC with entries that aren't real chapters.
Mark chapters with whether their title came from a detected heading, and
merge heading-less chapters into the preceding detected chapter instead of
pushing them as separate TOC entries. Fully heading-less text still chunks
into numbered fallback chapters as before.
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Huang Xin
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