fix: derive array batch behavior dynamically from source node batchMode

Edge metadata (arrayBatchAll) was stamped at connection creation time and
went stale if the source node's batchMode was toggled later. Now
connectedInputs.ts reads batchMode directly from the source node, making
batch behavior always consistent with the current toggle state.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/store/utils/connectedInputs.ts

@@ -229,7 +229,8 @@ export function getConnectedInputsPure(
       if (dimmedNodeIds && dimmedNodeIds.has(sourceNode.id)) return;
 
       // Array batch mode — send all items as textItems instead of a single item
-      if (sourceNode.type === "array" && (edge.data as Record<string, unknown> | undefined)?.arrayBatchAll === true) {
+      // Derive from source node's current batchMode (not edge metadata which can go stale)
+      if (sourceNode.type === "array" && (sourceNode.data as ArrayNodeData).batchMode === true) {
         const arrayData = sourceNode.data as ArrayNodeData;
         const items = arrayData.outputItems;
         if (items.length > 0) {

src/store/workflowStore.ts

@@ -146,11 +146,8 @@ function buildConnectionEdgeData(
   if (sourceNode?.type === "array" && (connection.sourceHandle || "text") === "text") {
     const sourceData = sourceNode.data as Record<string, unknown>;
 
-    // Batch mode: all items sent through a single connection
-    if (sourceData.batchMode === true) {
-      baseData.arrayBatchAll = true;
-      return baseData;
-    }
+    // Batch mode is now derived dynamically in connectedInputs.ts from
+    // the source node's batchMode — no need to stamp edge metadata.
 
     const selectedIndex = sourceData.selectedOutputIndex;
     const outputItems = Array.isArray(sourceData.outputItems) ? sourceData.outputItems : [];