feat: add auth screens and state management

windows/flutter/generated_plugin_registrant.cc

@@ -6,6 +6,12 @@
 
 #include "generated_plugin_registrant.h"
 
+#include <firebase_auth/firebase_auth_plugin_c_api.h>
+#include <firebase_core/firebase_core_plugin_c_api.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
+  FirebaseAuthPluginCApiRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("FirebaseAuthPluginCApi"));
+  FirebaseCorePluginCApiRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("FirebaseCorePluginCApi"));
 }

windows/flutter/generated_plugins.cmake

@@ -3,6 +3,8 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
+  firebase_auth
+  firebase_core
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST