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fix(slides): render mermaid diagrams (selector lang-mermaid → mermaid)

reveal.js 5.x emits `<code class="mermaid">` for ```mermaid fences;
renderMermaid still looked for the old `code.lang-mermaid` class, so no
diagram was ever found. The vendored mermaidAPI loads fine.

author
utensil
committer
Tangled
date (May 24, 2026, 9:45 AM +0300) commit 7aea930a parent fca10402
+1 -1
+1 -1
ml/js/common.js
··· 258 258 } 259 259 260 260 function renderMermaid(cur) { 261 - var diagramCodeTag = cur.querySelector('code.lang-mermaid'); 261 + var diagramCodeTag = cur.querySelector('code.mermaid'); 262 262 var renderedDiagram = cur.querySelector('.mermaidSvg'); 263 263 264 264 if(diagramCodeTag != null && mermaidAPI != null) {