Fix general issues

lib/core/app/app_view.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:flutter_animate/flutter_animate.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:hiddify/core/core_providers.dart';
 import 'package:hiddify/core/prefs/prefs.dart';
@@ -29,6 +28,6 @@ class AppView extends HookConsumerWidget with PresLogger {
       theme: theme.light(),
       darkTheme: theme.dark(),
       title: 'Hiddify Next',
-    ).animate().fadeIn();
+    );
   }
 }

lib/core/core_providers.dart

@@ -7,7 +7,7 @@ part 'core_providers.g.dart';
 TranslationsEn translations(TranslationsRef ref) =>
     ref.watch(localeProvider).translations();
 
-@riverpod
+@Riverpod(keepAlive: true)
 AppTheme theme(ThemeRef ref) => AppTheme(
       ref.watch(themeModeProvider),
       ref.watch(trueBlackThemeProvider),