fix(player): 修正缓冲态与首帧时间闪现

test/home/home_preview_layout_test.dart

@@ -855,6 +855,16 @@ void main() {
     await tester.pump();
     await gesture.up();
     await tester.pumpAndSettle();
+
+    controller.value = const VideoPlayerValue(
+      duration: Duration(seconds: 100),
+      position: Duration(seconds: 40),
+      isInitialized: true,
+      isBuffering: true,
+    );
+    await tester.pump(const Duration(milliseconds: 400));
+    expect(find.byKey(const Key('home-feed-progress-thumb')), findsOneWidget);
+    expect(find.byKey(const Key('progress-loading')), findsNothing);
   });
 
   testWidgets('should_show_refresh_spinner_until_refresh_finishes', (