fix: Extend direct HTML rendering to math elements

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

webclient/src/Article.js

@@ -5,6 +5,7 @@ import localForage from 'localforage';
 import { sourceLink, infoLine, ToggleDot } from './utils.js';
 
 const VOID_ELEMENTS = ['area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input', 'link', 'meta', 'param', 'source', 'track', 'wbr'];
+const DANGEROUS_TAGS = ['svg', 'math'];
 
 function Article({ cache }) {
 	const { id } = useParams();
@@ -106,7 +107,7 @@ function Article({ cache }) {
 				return null;
 			}
 
-			if (v.localName === 'svg') {
+			if (DANGEROUS_TAGS.includes(v.localName)) {
 				return <span key={key} dangerouslySetInnerHTML={{ __html: v.outerHTML }} />;
 			}