fix(player): 评论面板固定半屏高度

test/comment/drama_comments_sheet_test.dart

@@ -581,7 +581,7 @@ void main() {
     expect(find.byIcon(Icons.more_horiz_rounded), findsNothing);
   });
 
-  testWidgets('should_size_short_list_to_content', (tester) async {
+  testWidgets('should_use_half_screen_height_for_one_comment', (tester) async {
     tester.view.physicalSize = const Size(390, 844);
     tester.view.devicePixelRatio = 1;
     addTearDown(tester.view.resetPhysicalSize);
@@ -589,10 +589,7 @@ void main() {
     final repository = FakeCommentRepository(
       pages: [
         CommentPage(
-          comments: [
-            commentFixture(id: '10', content: 'Short list one'),
-            commentFixture(id: '11', content: 'Short list two'),
-          ],
+          comments: [commentFixture(id: '10', content: 'One comment')],
         ),
       ],
     );
@@ -600,14 +597,7 @@ void main() {
     await _pumpSheet(tester, repository: repository);
 
     final sheet = find.byKey(const Key('player-comments-sheet'));
-    expect(tester.getSize(sheet).height, lessThan(520));
-    final lastCommentBottom = tester
-        .getBottomLeft(find.byKey(const Key('comment-item-11')))
-        .dy;
-    final composerTop = tester
-        .getTopLeft(find.byKey(const Key('comment-composer')))
-        .dy;
-    expect(composerTop - lastCommentBottom, lessThan(80));
+    expect(tester.getSize(sheet).height, closeTo(844 / 2, 0.1));
   });
 
   testWidgets('should_keep_minimum_height_for_empty_state', (tester) async {
@@ -627,7 +617,7 @@ void main() {
     addTearDown(tester.view.resetPhysicalSize);
     addTearDown(tester.view.resetDevicePixelRatio);
     final repository = FakeCommentRepository(
-      pages: [CommentPage(comments: _comments(30))],
+      pages: [CommentPage(comments: _comments(20))],
     );
 
     await _pumpSheet(tester, repository: repository);
@@ -649,7 +639,7 @@ void main() {
     expect(position.pixels, greaterThan(0));
     expect(
       tester.getSize(find.byKey(const Key('player-comments-sheet'))).height,
-      520,
+      closeTo(844 / 2, 0.1),
     );
   });