Aggiunge pulsante per fermare un invio email in corso.

Permette di annullare i destinatari ancora in coda mantenendo le email già inviate.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/controllers/mailings_controller.rb

@@ -1,6 +1,6 @@
 class MailingsController < ApplicationController
   before_action :require_current_project!
-  before_action :set_mailing, only: %i[show edit update destroy queue test_send test_preview refresh_recipients update_recipients preview]
+  before_action :set_mailing, only: %i[show edit update destroy queue cancel test_send test_preview refresh_recipients update_recipients preview]
   before_action :load_form_collections, only: %i[new create edit update]
 
   def index
@@ -139,6 +139,20 @@ class MailingsController < ApplicationController
     redirect_to @mailing, alert: e.message
   end
 
+  def cancel
+    unless @mailing.sending?
+      redirect_to @mailing, alert: "Solo un invio in corso può essere fermato."
+      return
+    end
+
+    pending = @mailing.pending_count + @mailing.queued_count
+    @mailing.cancel_send!
+    redirect_to dashboard_mailings_path,
+                notice: "Invio fermato. #{@mailing.sent_count} già inviate, #{pending} annullate in coda."
+  rescue StandardError => e
+    redirect_to @mailing, alert: e.message
+  end
+
   def test_send
     assign_test_preview
     to = @test_to.to_s.strip