Markdown math formula rendering broken on web

Description

Math formulas (LaTeX) fail to render correctly on the web page, displaying raw LaTeX source instead of rendered equations.

Root cause: In packages/ui/src/context/marked.tsx, math rendering was implemented as a post-processing step after Markdown → HTML conversion (renderMathExpressions + renderMathInText), doing regex replacement on the generated HTML string. HTML tree structure and LaTeX syntax conflict in this approach, causing matching failures or malformed output.
Fix:

1. Removed the post-processing approach (renderMathInText, renderMathExpressions) in favor of marked's built-in tokenizer extensions, intercepting math tokens during Markdown parsing.
2. Relaxed blockMathRegex: previously required $$...$$ to be wrapped with newlines (^$$\n(...)\n$$), changed to ^$$([\s\S]*?)$$.
3. Added inlineDollarKatex extension: supports $...$ syntax for inline math (previously only (...) was supported).
   Affected: packages/ui/src/context/marked.tsx:379-567

Before:

After these fix:

Plugins

No response

OpenCode version

1.18

Steps to reproduce

Ask LLM for some latex

Screenshot and/or share link

No response

Operating System

OpenSUSE

Terminal

Wezterm