fix(editor): render math in visual table cells

[murongg]

Summary

• render inline $...$ and \(...\) math inside visual table cells with KaTeX
• share math range detection between the editor preview and table-cell renderer
• keep only the active formula as editable Markdown while preserving surrounding text and other rendered formulas
• support mouse, native button activation, shared-table Enter, Escape, Tab, and Shift+Tab interactions
• commit the active formula when clicking adjacent text, another formula, another cell, table controls, or outside the table
• keep escaped dollars, inline code, links, images, and table caret behavior unchanged

Validation

• pnpm test — 11 workspace projects and 2,692 tests passed
• pnpm build
• pnpm typecheck:test
• local CodeMirror browser QA:
  • physical click revealed formula source and outside click rendered the updated formula
  • Escape restored the original formula
  • Tab committed the formula and moved selection to the next cell
  • Enter and native button click opened formula editing
  • mixed cells retained surrounding text and other rendered formulas
  • switching between two formulas in one cell committed the first and opened the second in one click
  • Preview/Source transitions preserved the updated Markdown

Risk

• localized to inline math rendering and interaction inside visual table cells
• stores the active formula as a cell-local source range and refreshes it after input
• reuses the existing math delimiter rules to avoid parser drift
• scopes document listeners to the active table session and removes them with the table widget

Closes #697

[vercel]

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Project	Deployment	Actions	Updated (UTC)
markra-web	Ready	Preview	Aug 27, 2026 12:08pm