feat(playground): add AI chat interface for bot

src/app/(app)/problems/[id]/@ai/@bot/page.tsx

@@ -0,0 +1,47 @@
+"use client";
+
+import { useChat } from "@ai-sdk/react";
+import { SendHorizonal } from "lucide-react";
+import { Button } from "@/components/ui/button";
+import MdxPreview from "@/components/mdx-preview";
+import { Textarea } from "@/components/ui/textarea";
+import { ScrollArea, ScrollBar } from "@/components/ui/scroll-area";
+import { ChatMessageList } from "@/components/ui/chat/chat-message-list";
+import { ChatBubble, ChatBubbleAvatar, ChatBubbleMessage } from "@/components/ui/chat/chat-bubble";
+
+export default function AiBotPage() {
+  const { messages, input, handleInputChange, handleSubmit } = useChat();
+
+  return (
+    <div className="h-full flex flex-col">
+      <div className="flex-1">
+        <ScrollArea className="[&>[data-radix-scroll-area-viewport]]:max-h-[calc(100vh-238px)]">
+          <ChatMessageList>
+            {messages.map((message, index) => (
+              <ChatBubble key={index} layout="ai">
+                <ChatBubbleAvatar src="" fallback={message.role === "user" ? "US" : "AI"} />
+                <ChatBubbleMessage layout="ai">
+                  <MdxPreview source={message.content} />
+                </ChatBubbleMessage>
+              </ChatBubble>
+            ))}
+          </ChatMessageList>
+          <ScrollBar orientation="horizontal" />
+        </ScrollArea>
+      </div>
+      <footer className="h-36 flex flex-none">
+        <form onSubmit={handleSubmit} className="w-full p-4 pt-0 relative">
+          <Textarea
+            value={input}
+            onChange={handleInputChange}
+            className="h-full bg-muted border-transparent shadow-none rounded-lg"
+            placeholder="Bot will automatically get your current code"
+          />
+          <Button type="submit" variant="ghost" className="absolute bottom-6 right-6 h-6 w-auto px-2">
+            <SendHorizonal className="size-4" />
+          </Button>
+        </form>
+      </footer>
+    </div>
+  );
+}