fix: 修复SpeechGenerationModal中emotion字段的TypeScript类型错误

- 为emotion字段添加类型断言，确保e.target.value符合SpeechGenerationRequest接口的emotion联合类型要求
- 解决了'string'类型无法分配给emotion联合类型的编译错误

apps/desktop/src/components/SpeechGenerationModal.tsx

@@ -1,14 +1,12 @@
-import React, { useState, useCallback, useEffect } from 'react';
+import React, { useState, useCallback } from 'react';
 import {
   Volume2,
-  Play,
   Download,
   CheckCircle,
   XCircle,
   Loader2,
   Settings,
   Users,
-  Mic,
   ChevronDown
 } from 'lucide-react';
 import { invoke } from '@tauri-apps/api/core';
@@ -21,7 +19,6 @@ import {
   SpeechGenerationStatus,
   SpeechGenerationState,
   VoiceInfo,
-  GetVoicesResponse
 } from '../types/voiceClone';
 import { SystemVoice } from '../types/systemVoice';
 
@@ -68,7 +65,7 @@ export const SpeechGenerationModal: React.FC<SpeechGenerationModalProps> = ({
   // ============= 音色选择功能 =============
 
   const handleVoiceSelect = useCallback((voiceId: string, voiceInfo: VoiceInfo | SystemVoice, source: 'system' | 'custom') => {
-    const voiceName = 'voice_name' in voiceInfo ? voiceInfo.voice_name : voiceInfo.name;
+    const voiceName = voiceInfo.voice_name;
 
     setSelectedVoice({
       id: voiceId,
@@ -292,7 +289,7 @@ export const SpeechGenerationModal: React.FC<SpeechGenerationModalProps> = ({
           </label>
           <select
             value={speechRequest.emotion || 'calm'}
-            onChange={(e) => setSpeechRequest(prev => ({ ...prev, emotion: e.target.value }))}
+            onChange={(e) => setSpeechRequest(prev => ({ ...prev, emotion: e.target.value as 'happy' | 'sad' | 'angry' | 'fearful' | 'disgusted' | 'surprised' | 'calm' }))}
             disabled={speechState.status === SpeechGenerationStatus.GENERATING}
             className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent disabled:opacity-50"
           >