fix(agent): render dollar-delimited math correctly

[404Wolf]

Summary

• preserve the existing $...$ and $$...$$ math syntax
• import single-line and multiline $$ equations as display math instead of forcing them inline
• make static markdown honor each equation node's inline/display flag
• give agent transcript math the existing horizontal-overflow container
• add focused tests for inline $, single-line $$, and multiline $$

Scope

This intentionally does not add \(...\) or \[...\] parsing and does not change the shared math prompt.

Validation

• bunx vitest run --project lexical-core ../../packages/lexical-core/tests/katex.test.ts — 3 passed
• focused Biome check — passed
• bun run type-check — passed
• CI — 22 successful, 0 failed, 0 pending

Walkthrough

agent_dollar_math_rendering_stable.mp4

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📥 Commits

Reviewing files that changed from the base of the PR and between aecb02f and 051a20c.

📒 Files selected for processing (8)

• apps/web/src/features/block-agent/component/parts/TextPart.tsx
• apps/web/src/features/block-agent/debug/Gallery.tsx
• apps/web/src/index.css
• apps/web/src/lib/core/component/LexicalMarkdown/component/core/StaticMarkdown.tsx
• packages/lexical-core/tests/katex.test.ts
• packages/lexical-core/transformers/index.ts
• packages/lexical-core/transformers/katex.ts
• packages/lexical-core/transformers/tables.ts

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📝 Summary

Summary by CodeRabbit

• New Features

  • Added support for rendering inline and block equations using $, $$, \(...\), and \[...\] syntax.
  • Agent responses now correctly display mathematical expressions in Markdown.
  • Equations inside Markdown tables are supported.
  • Block equations can scroll horizontally when needed.

• Bug Fixes

  • Corrected equation rendering so block and inline formatting is preserved accurately.

Walkthrough

The change adds inline and block TeX equation transformers for Markdown, including \(...\) and \[...\] delimiters. Block equations now preserve their display state. The transformers are enabled in external, combined, and table parsing pipelines. Tests cover TeX, dollar-delimited, multiline, and internal XML equations. Agent markdown uses both transformer sets, renders equation state, supports horizontal scrolling for display math, and includes math examples in the gallery fixture.

Merge Risk: ⚪ Minimal · up to 051a2

This localized change adds LaTeX rendering support to agent transcripts while preserving the existing restricted KaTeX rendering path; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title uses the conventional commits format with the valid feat: prefix, is 54 characters long, and accurately summarizes the LaTeX rendering changes.
Description check	✅ Passed	The description clearly explains the LaTeX rendering changes, affected delimiters, UI updates, and test coverage.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

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