optimization: desktop UI (#747)

lib/view/page/server/tab/card_stat.dart

@@ -0,0 +1,27 @@
+part of 'tab.dart';
+
+typedef _CardNotifier = ValueNotifier<_CardStatus>;
+
+class _CardStatus {
+  final bool flip;
+  final bool? diskIO;
+  final NetViewType? net;
+
+  const _CardStatus({
+    this.flip = false,
+    this.diskIO,
+    this.net,
+  });
+
+  _CardStatus copyWith({
+    bool? flip,
+    bool? diskIO,
+    NetViewType? net,
+  }) {
+    return _CardStatus(
+      flip: flip ?? this.flip,
+      diskIO: diskIO ?? this.diskIO,
+      net: net ?? this.net,
+    );
+  }
+}