feat: add login hint on start page for unauthenticated users

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

assets/styles/app.css

@@ -585,11 +585,28 @@ body {
 
 .game-start-container {
     display: flex;
+    flex-direction: column;
     justify-content: center;
     align-items: center;
     min-height: calc(100vh - 64px - 80px);
 }
 
+.start-login-hint {
+    margin-top: 16px;
+    color: var(--text-muted);
+    font-size: 0.85rem;
+}
+
+.start-login-hint a {
+    color: var(--orange);
+    font-weight: 600;
+    text-decoration: none;
+}
+
+.start-login-hint a:hover {
+    text-decoration: underline;
+}
+
 .btn-start {
     padding: 14px 32px;
     font-size: 16px;

templates/homepage/index.html.twig

@@ -34,6 +34,11 @@
                 <button type="submit" class="btn btn-primary btn-start">Commencer une partie</button>
             </form>
             <div class="start-loader" id="start-loader"></div>
+            {% if not app.user %}
+                <p class="start-login-hint">
+                    <a href="{{ path('app_login') }}">Connectez-vous</a> pour importer vos propres films
+                </p>
+            {% endif %}
             <script>
                 document.getElementById('start-form').addEventListener('submit', function () {
                     this.style.display = 'none';