migrate l10n, state preloading

lib/app/screens/preload_screen.dart

@@ -0,0 +1,30 @@
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+
+import '../state/database.dart';
+import '../state/settings.dart';
+import '../state/source.dart';
+
+class PreloadScreen extends HookConsumerWidget {
+  const PreloadScreen({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final initializers = [
+      ref.watch(databaseInitializer),
+      ref.watch(sourceInitializer),
+      ref.watch(packageInfoInitializer),
+    ];
+
+    if (initializers.every((v) => v.hasValue)) {
+      Future.delayed(Duration(microseconds: 1)).then((_) {
+        if (context.mounted) {
+          context.replace('/');
+        }
+      });
+    }
+
+    return Container();
+  }
+}