update

frontend/react-template/src/components/FlowChart/FlowChart.tsx

@@ -1151,8 +1151,18 @@ const FlowChartComponent: ForwardRefRenderFunction<FlowChartRef, FlowChartProps>
                   nodeStroke = selectedNodeId === node.id ? "#06b6d4" : "#67e8f9";
                 }
 
+                // Detect remote children (targeted by arcs)
+                const hasRemoteParent = visibleData.edges.some((e) => e.type === "arc" && e.target.id === node.id);
+
                 return (
                   <g key={node.id} transform={`translate(${node.x},${node.y})`} onClick={(e) => handleNodeClick(node, e)}>
+                    {hasRemoteParent && node.type === "message" && (
+                      <rect
+                        x={-73} y={-28} width={146} height={56} rx={10}
+                        fill="none" stroke="#a855f7" strokeWidth={2} strokeDasharray="4,2"
+                        style={{ pointerEvents: "none" }}
+                      />
+                    )}
                     <rect
                       x={-70} y={-25} width={140} height={50} rx={8}
                       fill={nodeFill} stroke={selectedNodeId === node.id ? "#8b5cf6" : nodeStroke} strokeWidth={selectedNodeId === node.id ? 2 : 1}