fix(flutter): 统一下拉刷新主色文案

lib/core/widgets/app_pull_to_refresh.dart

@@ -173,15 +173,14 @@ class _AppPullToRefreshState extends State<AppPullToRefresh> {
         child: Icon(
           Icons.arrow_downward_rounded,
           size: 18,
-          color: armed ? AppColors.blue : AppColors.muted,
+          color: AppColors.blue,
         ),
       ),
       armed ? l10n.releaseToRefresh : l10n.pullToRefresh,
-      emphasized: armed,
     );
   }
 
-  Widget _label(Widget icon, String text, {bool emphasized = false}) {
+  Widget _label(Widget icon, String text) {
     return Row(
       mainAxisAlignment: MainAxisAlignment.center,
       children: [
@@ -189,10 +188,10 @@ class _AppPullToRefreshState extends State<AppPullToRefresh> {
         const SizedBox(width: 6),
         Text(
           text,
-          style: TextStyle(
+          style: const TextStyle(
-            color: emphasized ? AppColors.blue : AppColors.muted,
+            color: AppColors.blue,
-            fontSize: 12,
+            fontSize: 13,
-            fontWeight: emphasized ? FontWeight.w700 : FontWeight.w500,
+            fontWeight: FontWeight.w600,
           ),
         ),
       ],

test/core/app_pull_to_refresh_test.dart

@@ -4,6 +4,7 @@ import 'dart:async';
 
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:fruitshorts/core/theme/app_colors.dart';
 import 'package:fruitshorts/core/widgets/app_pull_to_refresh.dart';
 import 'package:fruitshorts/l10n/app_localizations.dart';
 
@@ -43,14 +44,26 @@ void main() {
       );
       expect(scrollable.position.pixels, lessThan(0));
       expect(find.text('Pull to refresh'), findsOneWidget);
+      expect(
+        tester.widget<Text>(find.text('Pull to refresh')).style?.color,
+        AppColors.blue,
+      );
 
       await gesture.moveBy(const Offset(0, 120));
       await tester.pump();
       expect(find.text('Release to refresh'), findsOneWidget);
+      expect(
+        tester.widget<Text>(find.text('Release to refresh')).style?.color,
+        AppColors.blue,
+      );
 
       await gesture.up();
       await tester.pump();
       expect(find.text('Refreshing…'), findsOneWidget);
+      expect(
+        tester.widget<Text>(find.text('Refreshing…')).style?.color,
+        AppColors.blue,
+      );
       expect(calls, 1);
 
       final duplicate = await tester.startGesture(