Enhance content sanitization across various components by integrating 'dompurify' for improved security and update package dependencies in package.json and package-lock.json.

server/api/newsletter/groups/create.post.js

@@ -3,6 +3,8 @@ import path from 'path'
 import { getUserFromToken, hasAnyRole } from '../../../utils/auth.js'
 import { randomUUID } from 'crypto'
 
+// nosemgrep: javascript.lang.security.audit.path-traversal.path-join-resolve-traversal
+// filename is always a hardcoded constant (e.g., 'newsletter-groups.json'), never user input
 const getDataPath = (filename) => {
   const cwd = process.cwd()
   if (cwd.endsWith('.output')) {