Add page data delivery and publication guards

mindspace-public-share-widget.mjs

@@ -1,4 +1,5 @@
 import crypto from 'node:crypto';
+import { injectBeforeDocumentClosingBody } from './html-document-injection.mjs';
 
 const PUBLIC_FILE_SHARE_SCRIPT = `(function(){
 var root=document.querySelector('[data-mindspace-public-share]');
@@ -199,7 +200,7 @@ ${plazaButtonMarkup}    <button type="button" data-action="capture">保存长图
 <script>${PUBLIC_FILE_SHARE_SCRIPT}</script>`;
   if (/<\/body>/i.test(source)) {
     return {
-      html: source.replace(/<\/body>/i, `${markup}</body>`),
+      html: injectBeforeDocumentClosingBody(source, markup),
       scriptHashes: [PUBLIC_FILE_SHARE_SCRIPT_HASH],
     };
   }