feat: add success flash on register

assets/styles/app.css

@@ -868,6 +868,16 @@ body {
     font-size: 13px;
 }
 
+.flash-success {
+    margin-bottom: 16px;
+    padding: 10px 16px;
+    background: #f0fdf4;
+    color: #166534;
+    border: 1px solid #bbf7d0;
+    border-radius: var(--radius-sm);
+    font-size: 13px;
+}
+
 .start-loader {
     display: none;
     width: 48px;

src/Controller/RegistrationController.php

@@ -37,6 +37,8 @@ class RegistrationController extends AbstractController
             $entityManager->persist($user);
             $entityManager->flush();
 
+            $this->addFlash('success', 'Compte créé avec succès');
+
             return $this->redirectToRoute('app_login');
         }
 

templates/security/login.html.twig

@@ -6,6 +6,10 @@
 <div class="auth-container">
     <h1>Se connecter</h1>
 
+    {% for message in app.flashes('success') %}
+        <div class="flash-success">{{ message }}</div>
+    {% endfor %}
+
     {% if error %}
         <div class="auth-error">{{ error.messageKey|trans(error.messageData, 'security') }}</div>
     {% endif %}