Markdown notes:
- peekNote.isMarkdown → MarkdownContent (react-markdown + remarkMath + rehypeKatex)
- GFM tables, code blocks, etc. supportés nativement
Rich text notes:
- KaTeX CSS importé (katex.min.css)
- useEffect rend les equations data-latex via katex.renderToString
- math-equation-block → display mode
- inline-math → inline mode
KaTeX lazy-loadé (await import('katex')) — pas dans le bundle initial