Fix TypeScript error in useChat

Resolved the TypeScript error indicating that the property 'id' does not exist on the type returned from the createNewConversation function. Adjusted the code to correctly reference the conversationId property.
[skip gpt_engineer]

src/hooks/useChat.ts

@@ -48,7 +48,7 @@ export const useChat = (userId: string | null) => {
 
     if (!currentId) {
       const newConversation = await createNewConversation(message)
-      currentId = newConversation.id
+      currentId = newConversation.conversationId
       title = newConversation.title
     }