refactor(email): share build/deliver skeleton across join emails

lib/mv_web/emails/join_confirmation_email.ex

@@ -2,15 +2,10 @@ defmodule MvWeb.Emails.JoinConfirmationEmail do
   @moduledoc """
   Sends the join request confirmation email (double opt-in) using the unified email layout.
   """
-  use Phoenix.Swoosh,
-    view: MvWeb.EmailsView,
-    layout: {MvWeb.EmailLayoutView, "layout.html"}
-
   use MvWeb, :verified_routes
-  import Swoosh.Email
   use Gettext, backend: MvWeb.Gettext, otp_app: :mv
 
-  alias Mv.Mailer
+  alias MvWeb.Emails.JoinEmail
 
   @doc """
   Sends the join confirmation email to the given address with the confirmation link.
@@ -31,22 +26,9 @@ defmodule MvWeb.Emails.JoinConfirmationEmail do
     confirm_url = url(~p"/confirm_join/#{token}")
     subject = gettext("Confirm your membership request")
 
-    assigns = %{
+    JoinEmail.deliver(email_address, "join_confirmation.html", subject, %{
       confirm_url: confirm_url,
-      subject: subject,
-      app_name: Mailer.mail_from() |> elem(0),
-      locale: Gettext.get_locale(MvWeb.Gettext),
       resend: Keyword.get(opts, :resend, false)
-    }
-
-    email =
-      new()
-      |> from(Mailer.mail_from())
-      |> to(email_address)
-      |> subject(subject)
-      |> put_view(MvWeb.EmailsView)
-      |> render_body("join_confirmation.html", assigns)
-
-    Mailer.deliver(email, Mailer.smtp_config())
+    })
   end
 end