fix: 完善前端事件处理逻辑

- 移除handleStartImport中的手动完成状态设置
- 完全依赖事件监听器处理导入完成状态
- 优化日志输出和错误处理
- 确保异步导入流程的一致性

apps/desktop/src/components/MaterialImportDialog.tsx

@@ -402,7 +402,6 @@ export const MaterialImportDialog: React.FC<MaterialImportDialogProps> = ({
                 <div className="relative">
                   <div className="w-20 h-20 mx-auto mb-6">
                     <div className="absolute inset-0 border-4 border-blue-200 rounded-full"></div>
-                    <div className="absolute inset-0 border-4 border-blue-600 rounded-full border-t-transparent animate-spin"></div>
                     <div className="absolute inset-2 flex items-center justify-center">
                       <Upload className="w-8 h-8 text-blue-600" />
                     </div>