fix & opt

fix: cant ping when launch page is ping
fix: button text color not primaryColor
opt: getting primaryColor

lib/data/model/app/dynamic_color.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/widgets.dart';
+
+import '../../../core/utils/ui.dart';
+
+class DynamicColor {
+  /// 白天模式显示的颜色
+  Color light;
+
+  /// 暗黑模式显示的颜色
+  Color dark;
+
+  DynamicColor(this.light, this.dark);
+
+  Color resolve(BuildContext context) => isDarkMode(context) ? dark : light;
+}