style(theme): 客户端切换深色视觉风格

lib/core/widgets/empty_state.dart

@@ -87,12 +87,11 @@ class _EmptyMark extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final dark = Theme.of(context).brightness == Brightness.dark;
     return Icon(
       icon,
       key: const Key('empty-state-icon'),
       size: compact ? _compactIconSize : _regularIconSize,
-      color: dark ? AppColors.gold : AppColors.blue,
+      color: AppColors.blueSoft,
     );
   }
 }