feat(flutter): 统一文字下拉刷新

lib/pages/downloads/downloads_page.dart

@@ -16,6 +16,7 @@ import '../../core/platform/haptics.dart';
 import '../../core/theme/app_colors.dart';
 import '../../core/theme/app_dimens.dart';
 import '../../core/theme/app_theme.dart';
+import '../../core/widgets/app_pull_to_refresh.dart';
 import '../../core/widgets/auth_gate.dart';
 import '../../core/widgets/empty_state.dart';
 import '../../core/widgets/plain_page_scaffold.dart';
@@ -90,9 +91,10 @@ class _DownloadsBody extends StatelessWidget {
       );
     }
     final policy = downloads.policy!;
-    return RefreshIndicator(
+    return AppPullToRefresh(
       onRefresh: downloads.load,
       child: ListView(
+        physics: const AlwaysScrollableScrollPhysics(),
         padding: const EdgeInsets.fromLTRB(16, 10, 16, 28),
         children: [
           _PolicyPanel(downloads: downloads, policy: policy),