Fix critical syntax error in vertex insertion handler

index.html

@@ -1737,6 +1737,14 @@
                         labelLayers[v.id].addTo(map);
                     }
 
+                    // Allow vertex insertion by clicking anywhere on the polyline
+                    routeLayers[v.id].on('click', (e) => {
+                        if (!v.active) return;
+                        if (!map.editTools) return;
+                        
+                        L.DomEvent.stopPropagation(e);
+                        
+                        const layer = routeLayers[v.id];
                         const point = e.latlng;
                         const latlngs = layer.getLatLngs();