Rôles, tableau de bord et tests unitaires

templates/bundles/TwigBundle/Exception/error500.html.twig

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+{% extends 'base.html.twig' %}
+{% block title %}500 - Server Error{% endblock %}
+{% block body %}
+<div class="text-center mt-5">
+    <h1 class="display-1 text-danger">500</h1>
+    <h2>Internal Server Error</h2>
+    <p class="text-muted">Something went wrong on our end. Please try again later.</p>
+    <a href="{{ path('app_server_index') }}" class="btn btn-primary">Back to Dashboard</a>
+</div>
+{% endblock %}