* feat(warichu): support warichu (割注) inline annotation layout
- Add warichu HTML transformer that converts <span class="warichu"> and
<warichu> elements into .warichu-pending placeholders during content load
- Implement runtime layout (layoutWarichu / relayoutWarichu) that measures
column position and splits text into small inline-block chunks (2 chars
each) so CSS column boundaries can break between them, preventing large
blank gaps in vertical-rl pagination
- Use column stride (column-width + column-gap) for accurate position
measurement across column boundaries
- Hook into stabilized event for initial layout and relayout on resize
- Add warichu CSS styles (inline-block chunks, half-size font, vertical align)
* fix(warichu): correct HTML slicing edge cases
- sliceHtml: re-emit tags that were already open before the slice start
so the result stays well-formed. Previously a slice past an opening
tag produced an orphan closing tag (e.g. "<b>Hello</b>"[3,5] →
"lo</b>" instead of "<b>lo</b>").
- sliceHtml / removeFirstVisibleChar / removeLastVisibleChar: treat HTML
entities (e.g. &) as one visible character so they aren't split or
truncated mid-entity (e.g. removeFirstVisibleChar("&rest") →
"amp;rest").
- buildNodes: drop a duplicate chunk.appendChild(l2).
- Add unit tests covering the above for the three pure helpers.
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Co-authored-by: Huang Xin <chrox.huang@gmail.com>
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