Inkbound 1.4.0

The table of contents now reaches inside chapters, so long notes are
navigable on an e-ink reader without scrolling.

• Heading sub-entries — every chapter's headings appear as nested links
  under its title in the EPUB's TOC (nav.xhtml), mirroring the document's
  heading hierarchy. Tapping one jumps straight to that section in the
  chapter.
• TOC heading depth setting — a dropdown (default level 3) controls how
  deep the sub-entries go, from level 1 through level 6; Off restores the
  plain chapter-only TOC byte-for-byte.
• First-heading rules — a chapter's leading # heading is its title and
  is not duplicated as a sub-entry; duplicate heading texts get unique
  anchors (-2, -3), and heading text with quotes, ampersands, or Thai
  characters displays correctly with valid, resolvable anchors.
• Sub-entries link to anchors stamped into the chapter documents, keeping
  every book epubcheck-clean under EPUB 3.3 rules (verified with epubcheck
  5.3.0), including on books with duplicate or exotic heading text.

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Install manually by downloading the assets below into <vault>/.obsidian/plugins/inkbound/, then enable Inkbound in Settings → Community plugins.