style: 调整搜索结果两列布局

test/home/k28_a_navigation_test.dart

@@ -146,7 +146,10 @@ void main() {
     );
     final delegate =
         results.gridDelegate as SliverGridDelegateWithFixedCrossAxisCount;
-    expect(delegate.crossAxisCount, 3);
+    expect(delegate.crossAxisCount, 2);
+    expect(delegate.crossAxisSpacing, 12);
+    expect(delegate.mainAxisSpacing, 16);
+    expect(results.padding, const EdgeInsets.fromLTRB(14, 12, 14, 24));
     await tester.tap(find.byKey(const Key('search-back')));
     await tester.pumpAndSettle();
     expect(find.byKey(const Key('recommend-page')), findsOneWidget);