feat: 新增聊天页面，包含消息发送、确认卡片、语音输入及打字机效果组件。

src/components/common/Typewriter/Typewriter.tsx

@@ -0,0 +1,32 @@
+import React, { useState, useEffect } from 'react';
+
+interface TypewriterProps {
+    text: string;
+    speed?: number;
+    onComplete?: () => void;
+    children?: (text: string) => React.ReactNode;
+}
+
+export const Typewriter: React.FC<TypewriterProps> = ({ text, speed = 30, onComplete, children }) => {
+    const [displayedText, setDisplayedText] = useState('');
+    const [currentIndex, setCurrentIndex] = useState(0);
+
+    useEffect(() => {
+        if (currentIndex < text.length) {
+            const timeout = setTimeout(() => {
+                setDisplayedText(prev => prev + text[currentIndex]);
+                setCurrentIndex(prev => prev + 1);
+            }, speed);
+
+            return () => clearTimeout(timeout);
+        } else if (onComplete) {
+            onComplete();
+        }
+    }, [currentIndex, text, speed, onComplete]);
+
+    if (children) {
+        return <>{children(displayedText)}</>;
+    }
+
+    return <>{displayedText}</>;
+};

src/pages/Chat/Chat.tsx

@@ -6,6 +6,7 @@ import ReactMarkdown from 'react-markdown';
 import remarkGfm from 'remark-gfm';
 import aiService from '../../services/aiService';
 import type { AIChatResponse, ConfirmationCard } from '../../types';
+import { Typewriter } from '../../components/common/Typewriter/Typewriter';
 import './Chat.css';
 
 interface Message {
@@ -273,16 +274,26 @@ export default function Chat() {
                     </div>
                 ) : (
                     <>
-                        {messages.map((msg) => (
+                        {messages.map((msg, index) => (
                             <div key={msg.id} className={`chat-message ${msg.role}`}>
                                 <div className="chat-message-avatar">
                                     {msg.role === 'assistant' ? '🪙' : '👤'}
                                 </div>
                                 <div>
                                     <div className="chat-message-content">
+                                        {msg.role === 'assistant' && index === messages.length - 1 ? (
+                                            <Typewriter text={msg.content} speed={20}>
+                                                {(text) => (
+                                                    <ReactMarkdown remarkPlugins={[remarkGfm]}>
+                                                        {text}
+                                                    </ReactMarkdown>
+                                                )}
+                                            </Typewriter>
+                                        ) : (
                                             <ReactMarkdown remarkPlugins={[remarkGfm]}>
                                                 {msg.content}
                                             </ReactMarkdown>
+                                        )}
                                     </div>
 
                                     {msg.confirmationCard && (