fix(player): 评论输入面板下方改为实色填充

test/comment/drama_comments_sheet_test.dart

@@ -387,6 +387,7 @@ void main() {
     tester.view.viewInsets = const FakeViewPadding(bottom: 180);
     await tester.pump();
     await tester.pump(const Duration(milliseconds: 200));
+    final keyboardUpInputTop = tester.getTopLeft(composer).dy;
     final keyboardUpBottom = tester.getBottomLeft(composer).dy;
     final keyboardUpPanelRect = tester.getRect(composerPanel);
     expect(tester.getSize(composer).height, closeTo(compactHeight, 0.1));
@@ -401,6 +402,7 @@ void main() {
     tester.view.viewInsets = const FakeViewPadding();
     await tester.pumpAndSettle();
     expect(composer, findsOneWidget);
+    expect(tester.getTopLeft(composer).dy, closeTo(keyboardUpInputTop, 0.1));
     expect(tester.getBottomLeft(composer).dy, closeTo(keyboardUpBottom, 0.1));
     expect(tester.getRect(composerPanel), keyboardUpPanelRect);
     expect(tester.widget<Material>(composerPanel).color, AppColors.card);