Add page data delivery and publication guards

mindspace-public-image-retry.mjs

@@ -1,4 +1,5 @@
 import crypto from 'node:crypto';
+import { injectBeforeDocumentClosingBody } from './html-document-injection.mjs';
 
 /**
  * Public MindSpace pages (workspace `/MindSpace/<userId>/public/*.html`) reference images via
@@ -51,7 +52,7 @@ export function injectPublicImageRetryScript(html) {
   const markup = `<script ${MARKER_ATTR}="1">${IMAGE_RETRY_SCRIPT}</script>`;
   if (/<\/body>/i.test(source)) {
     return {
-      html: source.replace(/<\/body>/i, `${markup}</body>`),
+      html: injectBeforeDocumentClosingBody(source, markup),
       scriptHashes: [IMAGE_RETRY_SCRIPT_HASH],
     };
   }