Aggiunge il rilevamento di invio e apertura delle email di campagna.

Ogni destinatario mostra se la mail è partita e se è stata aperta, con conteggi in dashboard.

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

test/controllers/mail_opens_controller_test.rb

@@ -0,0 +1,51 @@
+require "test_helper"
+
+class MailOpensControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    opportunities(:deal).update!(send_status: "to_send")
+    @mailing = create_mailing(audience: "to_send")
+    @mailing.rebuild_recipients!
+    @recipient = @mailing.mailing_recipients.first
+    @recipient.update!(status: "sent", sent_at: Time.current, rendered_subject: "Ciao ASD Test Calcio")
+  end
+
+  test "records the first open without login and returns a gif" do
+    assert_difference -> { Activity.where(activity_type: "email_opened").count }, 1 do
+      get mail_open_path(@recipient.tracking_token)
+    end
+
+    assert_response :success
+    assert_equal "image/gif", response.media_type
+    @recipient.reload
+    assert @recipient.opened?
+    assert_equal 1, @recipient.open_count
+    assert_equal @recipient.opened_at, @recipient.last_opened_at
+  end
+
+  test "counts later loads without duplicating the timeline activity" do
+    get mail_open_path(@recipient.tracking_token)
+    assert_no_difference -> { Activity.where(activity_type: "email_opened").count } do
+      get mail_open_path(@recipient.tracking_token)
+    end
+
+    @recipient.reload
+    assert_equal 2, @recipient.open_count
+    assert @recipient.last_opened_at >= @recipient.opened_at
+  end
+
+  test "unknown token still returns a gif" do
+    get mail_open_path("missing-token-value-here")
+    assert_response :success
+    assert_equal "image/gif", response.media_type
+  end
+
+  test "does not mark pending emails as opened" do
+    @recipient.update!(status: "pending", sent_at: nil)
+    get mail_open_path(@recipient.tracking_token)
+
+    assert_response :success
+    @recipient.reload
+    assert_not @recipient.opened?
+    assert_equal 0, @recipient.open_count
+  end
+end