Calc2

AGENTS.md

@@ -220,7 +220,15 @@ copy + an `APP_LANGUAGES` entry + the code in the backend's `SUPPORTED_LOCALES`.
 - `app/utils/markdown.ts` — the single render pipeline: `markdown-it` (**html: false**,
   raw HTML is escaped) + `markdown-it-texmath` + KaTeX (`$...$` inline, `$$...$$` display,
   macros `\R \N \Z \Q \C`) + highlight.js, sanitized with DOMPurify. It also builds the
-  TOC. Render all article Markdown through this, not ad-hoc renderers.
+  TOC. Fenced blocks tagged ` ```example / theorem / corollary / definition / proof /
+  proposition / lemma ` (optionally followed by a title) render as callout boxes —
+  blockquote-styled, collapsible through a native `<details>` whose summary is the
+  label row (always opens open; MarkdownView animates the fold with the Web
+  Animations API — the intent rides on `data-open`, motion skipped under
+  `prefers-reduced-motion`), each kind with its own hue (`--box-*` in
+  `_tokens.scss`, shape `.md-box` in `_prose.scss`) and a label written in the
+  *article's* language (`MarkdownView`'s `articleLang` → `renderMarkdown`'s env,
+  never the UI locale). Render all article Markdown through this, not ad-hoc renderers.
 - API calls use `$fetch` against `${useRuntimeConfig().public.apiBase}/api`.
 
 ## Gotchas