Start updating the app startup logic

Author: bizz84

lib/src/app.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:starter_architecture_flutter_firebase/src/routing/app_router.dart';
+import 'package:starter_architecture_flutter_firebase/src/routing/app_startup.dart';
 
 class MyApp extends ConsumerWidget {
   const MyApp({super.key});
@@ -12,6 +13,11 @@ class MyApp extends ConsumerWidget {
     final goRouter = ref.watch(goRouterProvider);
     return MaterialApp.router(
       routerConfig: goRouter,
+      builder: (_, child) {
+        return AppStartupWidget(
+          onLoaded: (_) => child!,
+        );
+      },
       theme: ThemeData(
         colorSchemeSeed: primaryColor,
         unselectedWidgetColor: Colors.grey,

lib/src/routing/app_startup.dart

@@ -76,3 +76,13 @@ class AppStartupErrorWidget extends StatelessWidget {
     );
   }
 }
+
+class AppStartupDataWidget extends StatelessWidget {
+  const AppStartupDataWidget({super.key, required this.child});
+  final Widget child;
+
+  @override
+  Widget build(BuildContext context) {
+    return child;
+  }
+}