fix math rendering in html -- more fallout of react19 upgrade

Author: williamstein

src/packages/frontend/components/html-ssr.tsx

@@ -17,8 +17,8 @@ import React from "react";
 import htmlReactParser, {
   attributesToProps,
   domToReact,
+  Element, Text
 } from "html-react-parser";
-import { Element, Text } from "domhandler";
 import stripXSS, { safeAttrValue, whiteList } from "xss";
 import type { IFilterXSSOptions } from "xss";
 import { useFileContext } from "@cocalc/frontend/lib/file-context";
@@ -116,6 +116,7 @@ export default function HTML({
     }
 
     try {
+      if (!(domNode instanceof Element)) return;
       const { name, children, attribs } = domNode;
 
       if (name == "script") {

src/packages/frontend/package.json

@@ -90,7 +90,6 @@
     "debug": "^4.4.0",
     "direction": "^1.0.4",
     "dog-names": "^2.1.0",
-    "domhandler": "^4.3.1",
     "dropzone": "^5.9.2",
     "entities": "^4.3.1",
     "escape-carriage": "^1.3.1",

src/packages/pnpm-lock.yaml

@@ -1,2 +1,2 @@
 /* autogenerated by the update_version script */
-exports.version=1752795879;
+exports.version=1753891241;