修复部分已知问题

views/ReadingView.tsx

@@ -1,5 +1,3 @@
-
-
 import React, { useState, useRef, useEffect } from 'react';
 import { Language, ReadingLesson, ReadingDifficulty, ChatMessage, Role, MessageType, ReadingLessonRecord } from '../types';
 import { geminiService, decodeAudioData } from '../services/geminiService';
@@ -536,7 +534,7 @@ const ReadingView: React.FC<ReadingViewProps> = ({ language, history, onSaveToHi
                                     <List size={18} /> {t.vocabTitle}
                                 </h4>
                                 <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
-                                    {lesson.vocabulary.map((v, i) => (
+                                    {lesson.vocabulary?.map((v, i) => (
                                         <div key={i} className="bg-white p-3 rounded-xl shadow-sm border border-emerald-100 hover:shadow-md transition-shadow relative group">
                                             <div className="flex items-baseline justify-between mb-1">
                                                 <div className="flex items-baseline gap-2">