fix: uid in shared pages

apps/server/src/collaboration/collaboration.util.ts

@@ -12,6 +12,7 @@ import { Color } from '@tiptap/extension-color';
 import { Youtube } from '@tiptap/extension-youtube';
 import Table from '@tiptap/extension-table';
 import TableHeader from '@tiptap/extension-table-header';
+import UniqueID from '@tiptap/extension-unique-id';
 import {
   Callout,
   Comment,
@@ -76,7 +77,11 @@ export const tiptapExtensions = [
   Drawio,
   Excalidraw,
   Embed,
-  Mention
+  Mention,
+  UniqueID.configure({
+    types: ['heading'],
+    attributeName: 'uid',
+  }),
 ] as any;
 
 export function jsonToHtml(tiptapJson: any) {