Tutorial: Fehlende _enableNavAfterDemo Methode wiederherstellen

Die Methode wurde bei einem frueheren Cleanup versehentlich entfernt.
Sie wird von allen 12 Demo-Methoden und _runDemo aufgerufen um nach
Demo-Ende das Pulsieren zu stoppen und Zurueck/Weiter-Buttons einzublenden.
Ohne diese Methode blieb "Demo laeuft..." fuer immer stehen.

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

src/static/dashboard.html

@@ -764,7 +764,7 @@
     <script src="/static/js/api_network.js?v=20260316a"></script>
     <script src="/static/js/network-graph.js?v=20260316a"></script>
     <script src="/static/js/app_network.js?v=20260316a"></script>
-    <script src="/static/js/tutorial.js?v=20260316t"></script>
+    <script src="/static/js/tutorial.js?v=20260316u"></script>
     <script src="/static/js/chat.js?v=20260316f"></script>
     <script>document.addEventListener("DOMContentLoaded",function(){Chat.init();Tutorial.init()});</script>
 

src/static/js/tutorial.js

@@ -2198,6 +2198,35 @@ const Tutorial = {
         this._enableNavAfterDemo();
     },
 
+    // -----------------------------------------------------------------------
+    // Navigation nach Demo-Ende freigeben
+    // -----------------------------------------------------------------------
+    _enableNavAfterDemo() {
+        var bubble = this._els.bubble;
+        if (!bubble) return;
+
+        // Pulsieren stoppen
+        bubble.classList.remove('tutorial-bubble-pulsing');
+
+        var nav = bubble.querySelector('.tutorial-bubble-nav');
+        if (!nav) return;
+        var index = this._currentStep;
+        var total = this._steps.length;
+
+        var navHtml = '';
+        if (index > 0) {
+            navHtml += '<button class="tutorial-btn tutorial-btn-back" onclick="Tutorial.prev()">Zurück</button>';
+        } else {
+            navHtml += '<span></span>';
+        }
+        if (index < total - 1) {
+            navHtml += '<button class="tutorial-btn tutorial-btn-next" onclick="Tutorial.next()">Weiter</button>';
+        } else {
+            navHtml += '<button class="tutorial-btn tutorial-btn-next" onclick="Tutorial.stop()">Fertig</button>';
+        }
+        nav.innerHTML = navHtml;
+    },
+
     // -----------------------------------------------------------------------
     // Keyboard
     // -----------------------------------------------------------------------