feat: 保留系统开屏并更新品牌素材

android/app/src/main/res/values/colors.xml

@@ -4,4 +4,4 @@
 <resources>
 	<color name="splash_background">#000000</color>
 	<color name="ic_launcher_background">#FF6B2C</color>
-</resources>
+</resources>

docs/plans/PROGRESS.md

@@ -1318,3 +1318,4 @@ $ flutter test
 - Launcher/Android 12 启动背景统一纯黑，自适应图标背景改为品牌橙。
 - Android/iOS 图标与启动资源已重新生成；应用内开屏固定 splash_logo，宽 200 等比居中。
 - `flutter analyze`：No issues found。
+- 移除 Flutter 内 `_startupSplash` 与 `startup-splash`，只保留系统原生开屏；最新斜体字标素材已重新生成。

lib/pages/home/home_view.dart

@@ -43,8 +43,6 @@ class HomePage extends StatefulWidget {
 }
 
 class _HomePageState extends State<HomePage> with WidgetsBindingObserver {
-  static const _splashAsset = 'assets/icon/splash_logo.png';
-
   bool _resumeRetryInFlight = false;
   HomeFeedController? _homeFeed;
   bool _recommendSeeded = false;
@@ -111,7 +109,7 @@ class _HomePageState extends State<HomePage> with WidgetsBindingObserver {
     AppLocalizations l10n,
   ) {
     if (catalog.loading) {
-      return catalog.settled ? _retryLoading() : _startupSplash();
+      return _retryLoading();
     }
     if (catalog.error != null) {
       return Scaffold(
@@ -158,23 +156,6 @@ class _HomePageState extends State<HomePage> with WidgetsBindingObserver {
     }
   }
 
-  Widget _startupSplash() {
-    return AnnotatedRegion<SystemUiOverlayStyle>(
-      value: SystemUiOverlayStyle.light,
-      child: ColoredBox(
-        color: AppColors.mediaBlack,
-        child: Center(
-          child: Image.asset(
-            _splashAsset,
-            key: const Key('startup-splash'),
-            width: 200,
-            fit: BoxFit.contain,
-          ),
-        ),
-      ),
-    );
-  }
-
   Widget _retryLoading() {
     return AnnotatedRegion<SystemUiOverlayStyle>(
       value: SystemUiOverlayStyle.light,

test/home/home_startup_splash_test.dart

@@ -2,7 +2,6 @@
 
 import 'dart:async';
 
-import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:provider/provider.dart';
@@ -39,12 +38,11 @@ void main() {
   });
 
   tearDown(() {
-    debugDefaultTargetPlatformOverride = null;
     AppConfig.clearRuntimeBaseUrl();
     AppConfig.ready = Future<void>.value();
   });
 
-  testWidgets('should_show_platform_startup_image_before_catalog_settles', (
+  testWidgets('should_show_loading_without_flutter_splash_before_settles', (
     tester,
   ) async {
     final controller = CatalogController(_EmptyCatalogRepository())
@@ -52,33 +50,10 @@ void main() {
       ..settled = false;
     addTearDown(controller.dispose);
 
-    for (final platform in [TargetPlatform.android, TargetPlatform.iOS]) {
+    await _pumpHomePage(tester, controller);
-      debugDefaultTargetPlatformOverride = platform;
-      await _pumpHomePage(tester, controller);
 
-      final image = tester.widget<Image>(
+    expect(find.byType(CircularProgressIndicator), findsOneWidget);
-        find.byKey(const Key('startup-splash')),
+    expect(find.byKey(const Key('startup-splash')), findsNothing);
-      );
-      final expectedAsset = platform == TargetPlatform.android
-          ? 'assets/icon/splash_logo_android12.png'
-          : 'assets/icon/splash_logo.png';
-      final expectedSize = platform == TargetPlatform.android ? 288.0 : 384.0;
-
-      expect(
-        image.image,
-        isA<AssetImage>().having(
-          (asset) => asset.assetName,
-          'assetName',
-          expectedAsset,
-        ),
-      );
-      expect(
-        tester.getSize(find.byKey(const Key('startup-splash'))),
-        Size.square(expectedSize),
-      );
-      expect(find.byType(CircularProgressIndicator), findsNothing);
-    }
-    debugDefaultTargetPlatformOverride = null;
   });
 
   testWidgets('should_show_spinner_when_retry_loads_after_catalog_settled', (
@@ -95,7 +70,7 @@ void main() {
     expect(find.byKey(const Key('startup-splash')), findsNothing);
   });
 
-  testWidgets('should_enter_home_and_remove_startup_image_when_data_is_ready', (
+  testWidgets('should_enter_home_after_loading_when_data_is_ready', (
     tester,
   ) async {
     AppConfig.ready = Future<void>.value();
@@ -116,8 +91,8 @@ void main() {
     );
     await tester.pump();
 
-    expect(find.byKey(const Key('startup-splash')), findsOneWidget);
+    expect(find.byKey(const Key('startup-splash')), findsNothing);
-    expect(find.byType(CircularProgressIndicator), findsNothing);
+    expect(find.byType(CircularProgressIndicator), findsOneWidget);
 
     catalog.complete(_feed);
     await tester.pumpAndSettle();