添加加载状态指示器

- 在切换供应商时显示加载状态
- 禁用操作按钮防止重复提交
- 提供视觉反馈改善用户体验

src/renderer/App.tsx

@@ -27,6 +27,7 @@ function App() {
     message: string
     type: 'success' | 'error' | 'info'
   } | null>(null)
+  const [isLoading, setIsLoading] = useState(false)
 
   // 加载供应商列表
   useEffect(() => {
@@ -88,7 +89,10 @@ function App() {
       title: '切换供应商',
       message: `确定要切换到"${provider.name}"吗？`,
       onConfirm: async () => {
+        setIsLoading(true)
         const success = await window.electronAPI.switchProvider(id)
+        setIsLoading(false)
+        
         if (success) {
           setCurrentProviderId(id)
           setMessageModal({
@@ -160,6 +164,7 @@ function App() {
           onSwitch={handleSwitchProvider}
           onDelete={handleDeleteProvider}
           onEdit={setEditingProviderId}
+          isLoading={isLoading}
         />
         
         {configPath && (

src/renderer/components/ProviderList.tsx

@@ -8,6 +8,7 @@ interface ProviderListProps {
   onSwitch: (id: string) => void
   onDelete: (id: string) => void
   onEdit: (id: string) => void
+  isLoading?: boolean
 }
 
 const ProviderList: React.FC<ProviderListProps> = ({
@@ -15,7 +16,8 @@ const ProviderList: React.FC<ProviderListProps> = ({
   currentProviderId,
   onSwitch,
   onDelete,
-  onEdit
+  onEdit,
+  isLoading = false
 }) => {
   return (
     <div className="provider-list">
@@ -52,20 +54,21 @@ const ProviderList: React.FC<ProviderListProps> = ({
                   <button 
                     className="enable-btn"
                     onClick={() => onSwitch(provider.id)}
-                    disabled={isCurrent}
+                    disabled={isCurrent || isLoading}
                   >
-                    启用
+                    {isLoading ? '处理中...' : '启用'}
                   </button>
                   <button 
                     className="edit-btn"
                     onClick={() => onEdit(provider.id)}
+                    disabled={isLoading}
                   >
                     编辑
                   </button>
                   <button 
                     className="delete-btn"
                     onClick={() => onDelete(provider.id)}
-                    disabled={isCurrent}
+                    disabled={isCurrent || isLoading}
                   >
                     删除
                   </button>