feat: email retry page on 550 rejection; confirmation_email optional in admin form

app/src/Dispatcher.php

@@ -122,6 +122,13 @@ class Dispatcher {
             };
         }
 
+        // /partage/retry-email  (GET: show retry form, POST: resend)
+        if ($path === '/partage/retry-email') {
+            return function() {
+                require APP_ROOT . '/public/partage/retry-email.php';
+            };
+        }
+
         // /partage/*
         if (preg_match('#^/partage(/.*)?$#', $path)) {
             return function() {