feat: notify configured recipients when something is booked

config/packages/messenger.yaml

@@ -18,7 +18,13 @@ framework:
             messenger.bus.default: []
 
         routing:
-            Symfony\Component\Mailer\Messenger\SendEmailMessage: async
+            # Mail is deliberately NOT routed to async. Nothing starts a worker on the server --
+            # deploy.php only stops them -- so a queued SendEmailMessage would be written to
+            # messenger_messages and stay there, with no error anywhere and nobody notified.
+            # Sending happens in the request instead; BookingNotifier catches a transport
+            # failure so it can never fail the booking that triggered it. Route it back here
+            # once a `messenger:consume async` worker actually runs.
+            # Symfony\Component\Mailer\Messenger\SendEmailMessage: async
             Symfony\Component\Notifier\Message\ChatMessage: async
             Symfony\Component\Notifier\Message\SmsMessage: async
 

config/packages/twig.yaml

@@ -2,6 +2,10 @@ twig:
     file_name_pattern: '*.twig'
     # One theme for the whole app, so it is registered globally rather than per-template.
     form_themes: ['forms.html.twig']
+    paths:
+        # Mail templates embed the logo with email.image('@images/logo.png'), which needs the file
+        # on a Twig path -- an asset URL would be a remote image most clients block.
+        '%kernel.project_dir%/assets/images': images
 
 when@test:
     twig: