fix(player): 评论输入浮层补齐键盘区域实底

test/comment/drama_comments_sheet_test.dart

@@ -350,8 +350,10 @@ void main() {
     await tester.pumpAndSettle();
 
     final composer = find.byKey(const Key('comment-composer-sheet'));
+    final composerPanel = find.byKey(const Key('comment-composer-panel'));
     final composerInput = find.byKey(const Key('comment-composer-input'));
     expect(composer, findsOneWidget);
+    expect(composerPanel, findsOneWidget);
     final overlayRoot = find.byKey(const Key('comment-composer-overlay'));
     expect(overlayRoot, findsOneWidget);
     final overlayStack = tester.widget<Stack>(overlayRoot);
@@ -386,8 +388,10 @@ void main() {
     await tester.pump();
     await tester.pump(const Duration(milliseconds: 200));
     final keyboardUpBottom = tester.getBottomLeft(composer).dy;
+    final keyboardUpPanelRect = tester.getRect(composerPanel);
     expect(tester.getSize(composer).height, closeTo(compactHeight, 0.1));
     expect(keyboardUpBottom, closeTo(844 - 180, 0.1));
+    expect(keyboardUpPanelRect.bottom, closeTo(844, 0.1));
     expect(
       tester.getBottomLeft(composerInput).dy,
       lessThanOrEqualTo(844 - 180),
@@ -398,6 +402,9 @@ void main() {
     await tester.pumpAndSettle();
     expect(composer, findsOneWidget);
     expect(tester.getBottomLeft(composer).dy, closeTo(keyboardUpBottom, 0.1));
+    expect(tester.getRect(composerPanel), keyboardUpPanelRect);
+    expect(tester.widget<Material>(composerPanel).color, AppColors.card);
+    expect(tester.getBottomLeft(composerPanel).dy, closeTo(844, 0.1));
     expect(commentsSheet, findsOneWidget);
     expect(list, findsOneWidget);
     expect(placeholder, findsOneWidget);