add firebase, add screen flow

lib/main.dart

@@ -10,6 +10,8 @@ import 'package:shared_preferences/shared_preferences.dart';
 import 'package:worker/app.dart';
 import 'package:worker/core/database/app_settings_box.dart';
 import 'package:worker/core/database/hive_initializer.dart';
+import 'package:firebase_core/firebase_core.dart';
+import 'firebase_options.dart';
 
 /// Main entry point of the Worker Mobile App
 ///
@@ -23,6 +25,10 @@ void main() async {
   // Ensure Flutter is initialized before async operations
   WidgetsFlutterBinding.ensureInitialized();
 
+  await Firebase.initializeApp(
+    options: DefaultFirebaseOptions.currentPlatform,
+  );
+
   // Set preferred device orientations
   await SystemChrome.setPreferredOrientations([
     DeviceOrientation.portraitUp,