fix(mailer): apply delivery_method directly to ActionMailer::Base

The ActionMailer railtie's on_load hook applies config.action_mailer.*
settings to ActionMailer::Base when ActionMailer::Base is first
referenced. In our initializer load order, devise.rb runs before
mailer.rb (alphabetical) and triggers ActionMailer::Base loading via
Devise::Mailer. By the time mailer.rb runs, the on_load hook has
already fired with the default :smtp delivery method, and subsequent
writes to config.action_mailer.delivery_method are silently ignored.

Result: production transactional emails (Devise confirmation, password
reset, member invitations) were being sent via Mail's default :smtp
delivery method to localhost:25, raising Errno::ECONNREFUSED on every
attempt — silently in deliver_later. LeadMail was never actually used
despite LEADMAIL_API_TOKEN being set.

Fix is to set ActionMailer::Base.delivery_method (and the matching
*_settings) directly in addition to config.action_mailer.*. Same pattern
applied to the SMTP and sendmail fallback branches for consistency.

Verified locally: rails runner now reports delivery_method=:leadmail
when LEADMAIL_API_TOKEN is set.

config/initializers/mailer.rb

@@ -32,17 +32,32 @@ Rails.application.configure do
   # Use LeadMail API if configured
   if ENV['LEADMAIL_API_TOKEN'].present?
     ActionMailer::Base.add_delivery_method :leadmail, LeadmailDelivery
-    config.action_mailer.delivery_method = :leadmail
-    config.action_mailer.leadmail_settings = {
+    leadmail_settings = {
       api_url: ENV.fetch('LEADMAIL_API_URL', 'https://mail.leadmagnet.dev/api/v1'),
       token: ENV['LEADMAIL_API_TOKEN']
     }
+    config.action_mailer.delivery_method = :leadmail
+    config.action_mailer.leadmail_settings = leadmail_settings
+    # === LeadChat: leadmail-delivery-fix (start) ===
+    # Devise (loaded earlier alphabetically) references ActionMailer::Base before
+    # this initializer runs, so the ActionMailer railtie's on_load hook has
+    # already finalised delivery_method to the default :smtp. Setting it via
+    # config.action_mailer.* alone is silently ignored. Apply directly to
+    # ActionMailer::Base so the config takes effect.
+    ActionMailer::Base.delivery_method = :leadmail
+    ActionMailer::Base.leadmail_settings = leadmail_settings
+    # === LeadChat: leadmail-delivery-fix (end) ===
   elsif !Rails.env.test?
     config.action_mailer.delivery_method = :smtp
     config.action_mailer.smtp_settings = smtp_settings
+    ActionMailer::Base.delivery_method = :smtp
+    ActionMailer::Base.smtp_settings = smtp_settings
 
     # Use sendmail if using postfix for email
-    config.action_mailer.delivery_method = :sendmail if ENV['SMTP_ADDRESS'].blank?
+    if ENV['SMTP_ADDRESS'].blank?
+      config.action_mailer.delivery_method = :sendmail
+      ActionMailer::Base.delivery_method = :sendmail
+    end
   end
 
   # You can use letter opener for your local development by setting the environment variable