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

pages/cms/newsletter.vue

@@ -168,7 +168,7 @@
                       </div>
                       <div
                         class="text-sm text-gray-600 prose prose-sm max-w-none mb-3"
-                        v-html="post.content.substring(0, 200) + (post.content.length > 200 ? '...' : '')"
+                        v-html="useSanitizeHtml(post.content.substring(0, 200) + (post.content.length > 200 ? '...' : ''))"
                       />
                       
                       <!-- Empfängerliste (collapsible) -->
@@ -770,6 +770,7 @@
 import { ref, computed, onMounted } from 'vue'
 import { Plus, Loader2, Users, Trash2 } from 'lucide-vue-next'
 import RichTextEditor from '~/components/RichTextEditor.vue'
+import { useSanitizeHtml } from '~/composables/useSanitizeHtml'
 
 const authStore = useAuthStore()