fix(recommend): 收窄拖动清屏范围并提升灵敏度

test/home/home_preview_layout_test.dart

@@ -3,6 +3,7 @@
 import 'dart:async';
 import 'dart:typed_data';
 
+import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:shared_preferences_platform_interface/in_memory_shared_preferences_async.dart';
@@ -664,6 +665,11 @@ void main() {
     );
     expect(bar.left, closeTo(overlayRect.left + 14, 0.1));
     expect(bar.width, closeTo(overlayRect.width * 0.7, 1));
+    expect(
+      tester.getCenter(find.byKey(const Key('home-feed-progress-track'))).dy -
+          bar.bottom,
+      greaterThanOrEqualTo(20),
+    );
     final buttonBackground =
         tester
                 .widget<DecoratedBox>(
@@ -685,7 +691,13 @@ void main() {
     );
     expect(
       tester.getSize(find.byKey(const Key('home-feed-progress'))).height,
-      greaterThanOrEqualTo(28),
+      greaterThanOrEqualTo(32),
+    );
+    expect(
+      tester
+          .widget<GestureDetector>(find.byKey(const Key('home-feed-progress')))
+          .dragStartBehavior,
+      DragStartBehavior.down,
     );
     final idleTrackCenter = tester
         .getRect(find.byKey(const Key('home-feed-progress-track')))