- Add ReadingMark TipTap extension (transient, never saved to DB) that
renders the active TTS passage as <span class='reading-word'>
- Build a char→ProseMirror position map on read-start so boundary events
can pinpoint exact document positions
- Use onstart (fires on every utterance/voice) for reliable sentence-level
highlight; onboundary overrides with word-level when the voice supports it
- Auto-scroll the highlighted span into view (smooth, centred) on each update
- Strip readingWord marks from JSON alongside lintError before saving
- Guard all mark dispatches with applyingLints flag to suppress spurious
saves and lint re-checks
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
chris
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