fix: pass array item index directly via edgeDataOverrides in auto-route

Instead of mutating selectedOutputIndex N times in a loop (which races
with React renders), pass { arrayItemIndex: index } as an edge data
override through onConnect. Adds optional edgeDataOverrides parameter
to onConnect and addEdgeWithType.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/nodes/ArrayNode.tsx

@@ -126,7 +126,6 @@ export function ArrayNode({ id, data, selected }: NodeProps<ArrayNodeType>) {
     const baseY = sourceNode.position.y;
     const promptHeight = 220;
     const verticalGap = 24;
-    const previousSelected = nodeData.selectedOutputIndex ?? null;
 
     items.forEach((item, index) => {
       const promptNodeId = addNode(
@@ -135,18 +134,19 @@ export function ArrayNode({ id, data, selected }: NodeProps<ArrayNodeType>) {
         { prompt: item }
       );
 
-      // Force each generated edge to bind to the matching array item index.
-      updateNodeData(id, { selectedOutputIndex: index });
-      onConnect({
-        source: id,
-        sourceHandle: "text",
-        target: promptNodeId,
-        targetHandle: "text",
-      });
+      // Pass the array item index directly as an edge data override
+      // instead of mutating selectedOutputIndex in a loop.
+      onConnect(
+        {
+          source: id,
+          sourceHandle: "text",
+          target: promptNodeId,
+          targetHandle: "text",
+        },
+        { arrayItemIndex: index }
+      );
     });
-
-    updateNodeData(id, { selectedOutputIndex: previousSelected });
-  }, [addNode, getNodes, id, nodeData.selectedOutputIndex, onConnect, previewItems, updateNodeData]);
+  }, [addNode, getNodes, id, onConnect, previewItems]);
 
   // Reset selection if it no longer points to a valid parsed item.
   useEffect(() => {

src/store/workflowStore.ts

@@ -185,8 +185,8 @@ interface WorkflowStore {
 
   // Edge operations
   onEdgesChange: (changes: EdgeChange<WorkflowEdge>[]) => void;
-  onConnect: (connection: Connection) => void;
-  addEdgeWithType: (connection: Connection, edgeType: string) => void;
+  onConnect: (connection: Connection, edgeDataOverrides?: Record<string, unknown>) => void;
+  addEdgeWithType: (connection: Connection, edgeType: string, edgeDataOverrides?: Record<string, unknown>) => void;
   removeEdge: (edgeId: string) => void;
   toggleEdgePause: (edgeId: string) => void;
 
@@ -532,7 +532,7 @@ export const useWorkflowStore = create<WorkflowStore>((set, get) => ({
     }
   },
 
-  onConnect: (connection: Connection) => {
+  onConnect: (connection: Connection, edgeDataOverrides?: Record<string, unknown>) => {
     set((state) => ({
       edges: addEdge(
         (() => {
@@ -540,7 +540,7 @@ export const useWorkflowStore = create<WorkflowStore>((set, get) => ({
           return {
             ...connection,
             id: `edge-${connection.source}-${connection.target}-${connection.sourceHandle || "default"}-${connection.targetHandle || "default"}`,
-            data: baseData,
+            data: edgeDataOverrides ? { ...baseData, ...edgeDataOverrides } : baseData,
           };
         })(),
         state.edges
@@ -550,7 +550,7 @@ export const useWorkflowStore = create<WorkflowStore>((set, get) => ({
     get().incrementManualChangeCount();
   },
 
-  addEdgeWithType: (connection: Connection, edgeType: string) => {
+  addEdgeWithType: (connection: Connection, edgeType: string, edgeDataOverrides?: Record<string, unknown>) => {
     set((state) => ({
       edges: addEdge(
         (() => {
@@ -559,7 +559,7 @@ export const useWorkflowStore = create<WorkflowStore>((set, get) => ({
             ...connection,
             id: `edge-${connection.source}-${connection.target}-${connection.sourceHandle || "default"}-${connection.targetHandle || "default"}`,
             type: edgeType,
-            data: baseData,
+            data: edgeDataOverrides ? { ...baseData, ...edgeDataOverrides } : baseData,
           };
         })(),
         state.edges