feat(splash): 缩短开屏停留并统一开屏图

lib/pages/home/home_view.dart

@@ -30,9 +30,6 @@ import 'home_logic.dart';
 import 'widgets/home_feed_grid.dart';
 import 'widgets/home_grid_header.dart';
 
-const Duration _startupSplashMinimumDuration = Duration(milliseconds: 400);
-const Duration _startupSplashFadeDuration = Duration(milliseconds: 200);
-
 class HomePage extends StatefulWidget {
   const HomePage({super.key});
 
@@ -44,31 +41,15 @@ class _HomePageState extends State<HomePage> with WidgetsBindingObserver {
   bool _resumeRetryInFlight = false;
   HomeFeedController? _homeFeed;
   bool _recommendSeeded = false;
-  Timer? _startupSplashMinimumTimer;
-  bool _catalogSettled = false;
-  bool _startupSplashVisible = true;
-  bool _startupSplashFadingOut = false;
-  bool _startupSplashMinimumElapsed = false;
-  bool _startupSplashDismissing = false;
-  bool _startupSplashSettledTriggered = false;
 
   @override
   void initState() {
     super.initState();
     WidgetsBinding.instance.addObserver(this);
-    WidgetsBinding.instance.addPostFrameCallback((_) {
-      if (!mounted) return;
-      _startupSplashMinimumTimer = Timer(_startupSplashMinimumDuration, () {
-        if (!mounted) return;
-        _startupSplashMinimumElapsed = true;
-        unawaited(_dismissStartupSplashIfReady());
-      });
-    });
   }
 
   @override
   void dispose() {
-    _startupSplashMinimumTimer?.cancel();
     _homeFeed?.dispose();
     WidgetsBinding.instance.removeObserver(this);
     super.dispose();
@@ -102,43 +83,12 @@ class _HomePageState extends State<HomePage> with WidgetsBindingObserver {
   @override
   Widget build(BuildContext context) {
     final catalog = context.watch<CatalogController>();
-    _catalogSettled = catalog.settled;
-    if (_startupSplashVisible &&
-        _catalogSettled &&
-        !_startupSplashSettledTriggered) {
-      _startupSplashSettledTriggered = true;
-      WidgetsBinding.instance.addPostFrameCallback((_) {
-        if (mounted) unawaited(_dismissStartupSplashIfReady());
-      });
-    }
     return Theme(
       data: AppTheme.dark(),
-      child: Stack(
-        fit: StackFit.expand,
-        children: [
-          _buildHome(context, catalog),
-          if (_startupSplashVisible)
-            _StartupSplashOverlay(fadingOut: _startupSplashFadingOut),
-        ],
-      ),
+      child: _buildHome(context, catalog),
     );
   }
 
-  Future<void> _dismissStartupSplashIfReady() async {
-    if (!mounted ||
-        !_startupSplashVisible ||
-        _startupSplashDismissing ||
-        !_startupSplashMinimumElapsed ||
-        !_catalogSettled) {
-      return;
-    }
-    _startupSplashDismissing = true;
-    setState(() => _startupSplashFadingOut = true);
-    await Future<void>.delayed(_startupSplashFadeDuration);
-    if (!mounted) return;
-    setState(() => _startupSplashVisible = false);
-  }
-
   Widget _buildHome(BuildContext context, CatalogController catalog) {
     final homeFeed = _ensureHomeFeed(catalog);
     if (!_recommendSeeded && catalog.dramas.isNotEmpty) {
@@ -162,35 +112,6 @@ class _HomePageState extends State<HomePage> with WidgetsBindingObserver {
   }
 }
 
-class _StartupSplashOverlay extends StatelessWidget {
-  const _StartupSplashOverlay({required this.fadingOut});
-
-  final bool fadingOut;
-
-  @override
-  Widget build(BuildContext context) {
-    return IgnorePointer(
-      child: AnimatedOpacity(
-        key: const Key('startup-splash'),
-        opacity: fadingOut ? 0 : 1,
-        duration: _startupSplashFadeDuration,
-        curve: Curves.easeOut,
-        child: ColoredBox(
-          color: AppColors.appBackground,
-          child: Center(
-            child: Image.asset(
-              'assets/icon/splash_logo.png',
-              key: const Key('startup-splash-logo'),
-              width: 240,
-              fit: BoxFit.contain,
-            ),
-          ),
-        ),
-      ),
-    );
-  }
-}
-
 /// 四个根页面共享同一路由并保持各自状态。
 class _HomeTabs extends StatefulWidget {
   const _HomeTabs({super.key, required this.feedController});