diff --git a/components/email/thread-conversation-view.tsx b/components/email/thread-conversation-view.tsx
index 27908391..86fa0ce2 100644
--- a/components/email/thread-conversation-view.tsx
+++ b/components/email/thread-conversation-view.tsx
@@ -88,6 +88,7 @@ export function ThreadConversationView({
   const trustedSendersAddressBook = useSettingsStore((state) => state.trustedSendersAddressBook);
   const isTrustedAddressBookSender = useContactStore((state) => state.isTrustedAddressBookSender);
   const addToTrustedSendersBook = useContactStore((state) => state.addToTrustedSendersBook);
+  const { client } = useAuthStore();
 
   // Track which emails are expanded (most recent by default)
   const [expandedIds, setExpandedIds] = useState<Set<string>>(new Set());
diff --git a/lib/demo/demo-client.ts b/lib/demo/demo-client.ts
index ef3e28c5..2870a074 100644
--- a/lib/demo/demo-client.ts
+++ b/lib/demo/demo-client.ts
@@ -481,6 +481,12 @@ export class DemoJMAPClient implements IJMAPClient {
   async getAddressBooks(): Promise<AddressBook[]> { return [...this.data.addressBooks]; }
   async getAllAddressBooks(): Promise<AddressBook[]> { return [...this.data.addressBooks]; }
 
+  async createAddressBook(name: string): Promise<AddressBook> {
+    const book: AddressBook = { id: `demo-book-${Date.now()}`, name };
+    this.data.addressBooks.push(book);
+    return book;
+  }
+
   async updateAddressBook(addressBookId: string, updates: Partial<AddressBook>): Promise<void> {
     const book = this.data.addressBooks.find(b => b.id === addressBookId);
     if (book) Object.assign(book, updates);