fix: change import of DefaultChatTransport to static import

Author: yaroslav8765

custom/composables/agentStore/useAgentChat.ts

@@ -1,8 +1,8 @@
-// import { DefaultChatTransport } from 'ai';
+import { DefaultChatTransport } from 'ai';
 import { shallowRef, type Ref } from 'vue';
 import { Chat } from '../../chat';
 import { getCurrentPageContext } from './pageContext';
-const { DefaultChatTransport } = await import('ai');
+// const { DefaultChatTransport } = await import('ai');
 
 type AgentImportMeta = ImportMeta & {
   env: {