Fix Legacy HTML page view

`.children` is a HTMLCollection object which doesn't have a forEach
interface. I confirmed this renders a few old style pages successfully.

Fixes https://github.com/galaxyproject/galaxy/issues/18144

client/src/components/PageDisplay/PageHtml.vue

@@ -32,7 +32,7 @@ export default {
             if (content) {
                 const vDom = document.createElement("div");
                 vDom.innerHTML = content;
-                const children = vDom.children;
+                const children = Object.values(vDom.children);
                 children.forEach((child) => {
                     if (child.classList.contains("embedded-item")) {
                         const splitId = child.id.split("-");