Close signature.html when aster is unloaded

js/master.js

@@ -1260,5 +1260,32 @@ window.updateDynamicTranslationsCustom = function() {
     }
 };
 
+// Send discard signal when page is closed
+window.addEventListener('beforeunload', () => {
+    if (ws && ws.readyState === WebSocket.OPEN) {
+        try {
+            ws.send(JSON.stringify({
+                type: 'discard'
+            }));
+            console.log('Discard-Signal gesendet beim Schließen der Seite');
+        } catch (error) {
+            console.error('Fehler beim Senden des Discard-Signals:', error);
+        }
+    }
+});
+
+// Also send on page unload (fallback)
+window.addEventListener('unload', () => {
+    if (ws && ws.readyState === WebSocket.OPEN) {
+        try {
+            ws.send(JSON.stringify({
+                type: 'discard'
+            }));
+        } catch (error) {
+            // Ignore errors during unload
+        }
+    }
+});
+
 // Connect WebSocket on load
 connectWebSocket();