fix(flutter): 回退底部导航为四槽

test/home/k28_a_navigation_test.dart

@@ -33,9 +33,8 @@ void main() {
     for (final key in _tabKeys) {
       expect(find.byKey(key), findsOneWidget);
     }
-    expect(find.byKey(const Key('nav-center-action')), findsOneWidget);
 
-    await tester.tap(find.byKey(const Key('nav-center-action')));
+    await tester.tap(find.byKey(const Key('tab-create')));
     await tester.pumpAndSettle();
 
     expect(find.byKey(const Key('create-page')), findsOneWidget);