Added login page

views/partials/_header.twig

@@ -1,6 +1,29 @@
-<header>
-    <h1>
-        <a href="/">Mon Blog</a> |
-        <a href="/admin">Admin</a>
-    </h1>
-</header>
+<header style="border-bottom: 1px solid #ccc; padding: 1rem 0; margin-bottom: 2rem;">
+    <div style="display: flex; justify-content: space-between; align-items: center;">
+        <h1 style="margin: 0;">
+            <a href="/" style="text-decoration: none; color: inherit;">Mon Blog</a>
+        </h1>
+
+        <nav>
+            {% if session.user_id is defined and session.user_id %}
+            {# Utilisateur connecté #}
+            <span style="margin-right: 1rem;">
+                Connecté en tant que : <strong>{{ session.username }}</strong>
+            </span>
+            <a href="/admin" style="margin-right: 1rem;">Admin</a>
+            <form method="post" action="/logout" style="display: inline;">
+                <input type="hidden" name="{{ csrf.keys.name }}" value="{{ csrf.name }}">
+                <input type="hidden" name="{{ csrf.keys.value }}" value="{{ csrf.value }}">
+                <button type="submit"
+                    style="background: none; border: none; color: #007bff; cursor: pointer; text-decoration: underline;">
+                    Déconnexion
+                </button>
+            </form>
+            {% else %}
+            {# Utilisateur non connecté #}
+            <a href="/login" style="margin-right: 1rem;">Connexion</a>
+            <a href="/register">S'enregistrer</a>
+            {% endif %}
+        </nav>
+    </div>
+</header>