Add sign in flow using magic links

test/controllers/controller_authentication_test.rb

@@ -1,19 +1,18 @@
 require "test_helper"
 
 class ControllerAuthenticationTest < ActionDispatch::IntegrationTest
-  test "access without an account slug redirects to new session" do
+  test "access without an account slug redirects to login menu" do
     integration_session.default_url_options[:script_name] = "" # no tenant
 
     get cards_path
 
-    assert_response :success
-    assert_dom "p", text: "You don't have any existing BOXCAR accounts."
+    assert_redirected_to session_login_menu_path
   end
 
   test "access with an account slug but no session redirects to new session" do
     get cards_path
 
-    assert_redirected_to new_session_path
+    assert_redirected_to new_session_path(script_name: nil)
   end
 
   test "access with an account slug and a session allows functional access" do