fix(flutter): 修复详情与播放器底部闪白

test/player/player_fullscreen_test.dart

@@ -1,6 +1,7 @@
 // Author: fruit.com.cn
 
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:shared_preferences_platform_interface/in_memory_shared_preferences_async.dart';
 import 'package:shared_preferences_platform_interface/shared_preferences_async_platform_interface.dart';
@@ -50,6 +51,16 @@ void main() {
     expect(tester.takeException(), isNull);
   });
 
+  testWidgets('should_use_black_system_navigation_bar_on_feed_and_player', (
+    tester,
+  ) async {
+    await _pumpApp(tester);
+    _expectPlayerNavigationBar(tester);
+
+    await _openSeriesPlayer(tester);
+    _expectPlayerNavigationBar(tester);
+  });
+
   testWidgets('should_fall_back_to_black_when_poster_is_empty', (tester) async {
     await _pumpApp(
       tester,
@@ -716,6 +727,20 @@ void main() {
     final delegate =
         grid.gridDelegate as SliverGridDelegateWithFixedCrossAxisCount;
     expect(delegate.crossAxisCount, 6);
+    final overlay = tester.widget<AnnotatedRegion<SystemUiOverlayStyle>>(
+      find.byKey(const Key('player-episodes-system-overlay')),
+    );
+    expect(overlay.value.systemNavigationBarColor, AppColors.card);
+    expect(overlay.value.systemNavigationBarContrastEnforced, isFalse);
+    final safeArea = tester.widget<SafeArea>(
+      find
+          .descendant(
+            of: find.byKey(const Key('player-episodes-sheet')),
+            matching: find.byType(SafeArea),
+          )
+          .first,
+    );
+    expect(safeArea.bottom, isTrue);
     expect(tester.takeException(), isNull);
   });
 
@@ -969,6 +994,16 @@ void main() {
   });
 }
 
+void _expectPlayerNavigationBar(WidgetTester tester) {
+  final overlay = tester.widget<AnnotatedRegion<SystemUiOverlayStyle>>(
+    find.byKey(const Key('player-system-overlay')).last,
+  );
+  expect(overlay.value.systemNavigationBarColor, Colors.black);
+  expect(overlay.value.systemNavigationBarDividerColor, Colors.transparent);
+  expect(overlay.value.systemNavigationBarContrastEnforced, isFalse);
+  expect(overlay.value.systemNavigationBarIconBrightness, Brightness.light);
+}
+
 void _expectFullscreenOverlay(WidgetTester tester) {
   expect(find.byKey(const Key('player-back')), findsOneWidget);
   expect(find.byKey(const Key('player-episode-heading')), findsOneWidget);