feat: SAML authentication controllers [CW-2958] (#12319)

config/initializers/omniauth.rb

@@ -1,3 +1,7 @@
+# OmniAuth configuration
+# Sets the full host URL for callbacks and proper redirect handling
+OmniAuth.config.full_host = ENV.fetch('FRONTEND_URL', 'http://localhost:3000')
+
 Rails.application.config.middleware.use OmniAuth::Builder do
   provider :google_oauth2, ENV.fetch('GOOGLE_OAUTH_CLIENT_ID', nil), ENV.fetch('GOOGLE_OAUTH_CLIENT_SECRET', nil), {
     provider_ignores_state: true