add firebase, add screen flow

ios/Podfile

@@ -1,5 +1,5 @@
 # Uncomment this line to define a global platform for your project
-platform :ios, '13.0'
+platform :ios, '15.0'
 
 # CocoaPods analytics sends network stats synchronously affecting flutter build latency.
 ENV['COCOAPODS_DISABLE_STATS'] = 'true'
@@ -39,7 +39,7 @@ end
 # OneSignal Notification Service Extension (OUTSIDE Runner target)
 target 'OneSignalNotificationServiceExtension' do
   use_frameworks!
-  pod 'OneSignalXCFramework', '>= 5.0.0', '< 6.0'
+  pod 'OneSignalXCFramework', '5.2.14'
 end
 
 post_install do |installer|
@@ -48,7 +48,7 @@ post_install do |installer|
 
     # Ensure consistent deployment target
     target.build_configurations.each do |config|
-      config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '13.0'
+      config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '15.0'
     end
   end
 end