feat(splash): 缩短开屏停留并统一开屏图

test/home/home_startup_splash_test.dart

@@ -36,7 +36,7 @@ void main() {
     AppConfig.ready = Future<void>.value();
   });
 
-  testWidgets('should_show_brand_splash_and_grid_skeleton_while_loading', (
+  testWidgets('should_show_grid_skeleton_without_an_in_app_splash', (
     tester,
   ) async {
     final repository = _PendingCatalogRepository();
@@ -47,8 +47,7 @@ void main() {
     expect(find.byKey(const Key('home-grid-header')), findsOneWidget);
     expect(find.byKey(const Key('home-grid-skeleton')), findsOneWidget);
     expect(find.byKey(const Key('home-tabs-bar')), findsOneWidget);
-    expect(find.byKey(const Key('startup-splash')), findsOneWidget);
-    expect(find.byKey(const Key('startup-splash-logo')), findsOneWidget);
+    expect(find.byKey(const Key('startup-splash')), findsNothing);
     expect(find.byType(CircularProgressIndicator), findsNothing);
 
     repository.complete(_feed);