动画效果美化

lib/widgets/app_refresh_indicator.dart

@@ -0,0 +1,28 @@
+import 'package:flutter/material.dart';
+
+/// 自定义下拉刷新包装器 — 统一使用品牌色
+class AppRefreshIndicator extends StatelessWidget {
+  final Future<void> Function() onRefresh;
+  final Widget child;
+  final String? semanticsLabel;
+
+  const AppRefreshIndicator({
+    super.key,
+    required this.onRefresh,
+    required this.child,
+    this.semanticsLabel,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return RefreshIndicator(
+      onRefresh: onRefresh,
+      color: const Color(0xFF1A1A1A),
+      backgroundColor: Colors.white,
+      strokeWidth: 2.5,
+      displacement: 60,
+      semanticsLabel: semanticsLabel,
+      child: child,
+    );
+  }
+}