Building a production-ready AI chat interface in React requires more than just displaying messages. You need streaming responses, markdown rendering, code highlighting, error handling, and a polished UX. Here's the complete implementation. Core Chat Component `typescript // ChatWindow.tsx import React, { useState, useRef, useEffect } from 'react'; import ReactMarkdown from 'react-markdown'; import { Prism as SyntaxHighlighter } from 'react-syntax-highlighter'; interface Message { id: string; role: 'user' | 'assistant'; content: string; timestamp: Date; } interface ChatWindowProps { apiKey: string; model?: string; } export function ChatWindow({ apiKey, model = 'claude-3-5-sonnet-20241022' }: ChatWindowProps) { const [messages, setMessages] = useState([]); const [input, setInput] = useState(''); const [isLoading, setIsLoading] = useState(false); const [error, setError] = useState(null); const messagesEndRef = useRef(null); const scrollToBottom = () => { messagesEndRef.current?.scrollIntoView({ behavior:…