Improve chat navigation, model selection, and streaming

components/chat/index.ts

@@ -1,9 +1,8 @@
 export { ChatAgent } from "./ChatAgent";
 export { ChatInput } from "./ChatInput";
-export { ChatMessage } from "./ChatMessage";
 export { ChatMessages } from "./ChatMessages";
 export { ChatPrompt } from "./ChatPrompt";
 export { ChatSidebar } from "./ChatSidebar";
 export type { Chat } from "./ChatSidebar";
-export type { Message } from "./ChatMessage";
+export type { UIMessage as Message } from "ai";
 export type { PromptSuggestion } from "./ChatPrompt";