fix(flutter): 剧场搜索框改为浅灰胶囊

test/discover/home_all_dramas_grid_test.dart

@@ -182,12 +182,18 @@ void main() {
                 .decoration!
             as BoxDecoration;
 
-    expect(shell().borderRadius, BorderRadius.circular(20));
-    expect((shell().border! as Border).top.color, AppColors.border);
+    expect(shell().borderRadius, BorderRadius.circular(22));
+    expect(shell().color, AppColors.commentInput);
+    expect((shell().border! as Border).top.color, Colors.transparent);
+    expect(
+      tester.getSize(find.byKey(const Key('discover-search-shell'))).height,
+      44,
+    );
 
     await tester.tap(find.byKey(const Key('discover-search')));
     await tester.pump(const Duration(milliseconds: 200));
 
+    expect(shell().color, AppColors.card);
     expect((shell().border! as Border).top.color, AppColors.blue);
   });