feat(ui): 增加视觉 token 与统一导航

lib/app.dart

@@ -3,6 +3,7 @@
 import 'dart:async';
 
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:provider/provider.dart';
 
 import 'core/config/locale_controller.dart';
@@ -39,6 +40,7 @@ import 'core/data/services/playback_session.dart';
 import 'core/data/services/video_player_port.dart';
 import 'core/platform/haptics.dart';
 import 'core/theme/app_theme.dart';
+import 'core/theme/app_colors.dart';
 import 'l10n/app_localizations.dart';
 import 'pages/home/home_view.dart';
 
@@ -218,9 +220,17 @@ class _LumaDramaAppState extends State<LumaDramaApp> {
           localeResolutionCallback: (deviceLocale, _) =>
               resolveAppLocale(locale.locale, deviceLocale),
           debugShowCheckedModeBanner: false,
-          themeMode: ThemeMode.system,
+          themeMode: ThemeMode.dark,
           theme: AppTheme.light(),
           darkTheme: AppTheme.dark(),
+          builder: (context, child) => AnnotatedRegion<SystemUiOverlayStyle>(
+            value: SystemUiOverlayStyle.light.copyWith(
+              statusBarColor: Colors.transparent,
+              systemNavigationBarColor: AppColors.bar,
+              systemNavigationBarIconBrightness: Brightness.light,
+            ),
+            child: child ?? const SizedBox.shrink(),
+          ),
           home: const HomePage(),
         ),
       ),