Add rtf_span_row() for horizontal cell merging#291

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BrianLang wants to merge 4 commits into

feature/rtf-span-row

Commits on May 29, 2026

Add rtf_span_row() for native horizontal cell merging
langbr_merck
committed
Style code (GHA)
BrianLang
committed
Add rtf_span_row to pkgdown reference section
langbr_merck
committed
Revert .gitignore change unrelated to feature
langbr_merck
committed