fix: adapt tests to updated deps

test/mv/mailer_test.exs

@@ -5,12 +5,14 @@ defmodule Mv.MailerTest do
   Uses Swoosh.Adapters.Test (configured in test.exs); no real SMTP. Asserts
   success/error contract and that one test email is sent on success.
   """
-  use Mv.DataCase, async: true
+  use Mv.DataCase, async: false
 
   import Swoosh.TestAssertions
 
   alias Mv.Mailer
 
+  setup :set_swoosh_global
+
   describe "send_test_email/1" do
     test "returns {:ok, email} and sends one email with expected subject/body when successful" do
       to_email = "test-#{System.unique_integer([:positive])}@example.com"