refactor: remove skippedNodeIds from store, extract resetSkippedNodes helper

skippedNodeIds was in the Zustand store interface but never read by any
component — it was only used as a local variable during executeWorkflow.
Removed the store field/initial state/set() calls, keeping only the local
variable.

Also extracted the duplicate 5-line skip-reset block (success + error paths)
into a resetSkippedNodes() helper inside executeWorkflow.

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

src/store/workflowStore.ts

@@ -373,9 +373,6 @@ interface WorkflowStore {
   // Switch dimming state
   dimmedNodeIds: Set<string>;
 
-  // Skip propagation state (optional empty inputs)
-  skippedNodeIds: Set<string>;
-
   // Switch dimming actions
   recomputeDimmedNodes: () => void;
 
@@ -510,9 +507,6 @@ const workflowStoreImpl: StateCreator<WorkflowStore> = (set, get) => ({
   // Switch dimming initial state
   dimmedNodeIds: new Set<string>(),
 
-  // Skip propagation initial state
-  skippedNodeIds: new Set<string>(),
-
   setEdgeStyle: (style: EdgeStyle) => {
     set({ edgeStyle: style });
   },
@@ -1005,7 +999,15 @@ const workflowStoreImpl: StateCreator<WorkflowStore> = (set, get) => ({
     const abortController = new AbortController();
     const isResuming = startFromNodeId === get().pausedAtNodeId;
     const skippedNodeIds = new Set<string>();
-    set({ isRunning: true, pausedAtNodeId: null, currentNodeIds: [], skippedNodeIds: new Set(), _abortController: abortController });
+    const resetSkippedNodes = () => {
+      for (const skippedId of skippedNodeIds) {
+        const skippedNode = get().nodes.find((n) => n.id === skippedId);
+        if (skippedNode && (skippedNode.data as Record<string, unknown>).status !== undefined) {
+          get().updateNodeData(skippedId, { status: "idle" } as Partial<WorkflowNodeData>);
+        }
+      }
+    };
+    set({ isRunning: true, pausedAtNodeId: null, currentNodeIds: [], _abortController: abortController });
 
     // Start logging session
     await logger.startSession();
@@ -1087,7 +1089,6 @@ const workflowStoreImpl: StateCreator<WorkflowStore> = (set, get) => ({
           (node.type === "prompt" && !(nodeData.prompt as string)?.trim());
         if (isEmpty) {
           skippedNodeIds.add(node.id);
-          set({ skippedNodeIds: new Set(skippedNodeIds) });
           logger.info('node.execution', 'Node skipped (optional input empty)', {
             nodeId: node.id,
             nodeType: node.type,
@@ -1101,7 +1102,6 @@ const workflowStoreImpl: StateCreator<WorkflowStore> = (set, get) => ({
       const hasSkippedSource = incomingEdgesForSkip.some((e) => skippedNodeIds.has(e.source));
       if (hasSkippedSource) {
         skippedNodeIds.add(node.id);
-        set({ skippedNodeIds: new Set(skippedNodeIds) });
         if (nodeData.status !== undefined) {
           get().updateNodeData(node.id, { status: "skipped" } as Partial<WorkflowNodeData>);
         }
@@ -1255,15 +1255,9 @@ const workflowStoreImpl: StateCreator<WorkflowStore> = (set, get) => ({
         logger.info('workflow.end', 'Workflow execution completed successfully');
       }
 
-      // Reset skipped nodes' status back to idle
-      for (const skippedId of skippedNodeIds) {
-        const skippedNode = get().nodes.find((n) => n.id === skippedId);
-        if (skippedNode && (skippedNode.data as Record<string, unknown>).status !== undefined) {
-          get().updateNodeData(skippedId, { status: "idle" } as Partial<WorkflowNodeData>);
-        }
-      }
+      resetSkippedNodes();
 
-      set({ isRunning: false, currentNodeIds: [], skippedNodeIds: new Set(), _abortController: null });
+      set({ isRunning: false, currentNodeIds: [], _abortController: null });
 
       saveLogSession();
       await logger.endSession();
@@ -1279,14 +1273,8 @@ const workflowStoreImpl: StateCreator<WorkflowStore> = (set, get) => ({
           "error"
         );
       }
-      // Reset skipped nodes' status back to idle
-      for (const skippedId of skippedNodeIds) {
-        const skippedNode = get().nodes.find((n) => n.id === skippedId);
-        if (skippedNode && (skippedNode.data as Record<string, unknown>).status !== undefined) {
-          get().updateNodeData(skippedId, { status: "idle" } as Partial<WorkflowNodeData>);
-        }
-      }
-      set({ isRunning: false, currentNodeIds: [], skippedNodeIds: new Set(), _abortController: null });
+      resetSkippedNodes();
+      set({ isRunning: false, currentNodeIds: [], _abortController: null });
 
       saveLogSession();
       await logger.endSession();
@@ -1299,7 +1287,7 @@ const workflowStoreImpl: StateCreator<WorkflowStore> = (set, get) => ({
     if (controller) {
       controller.abort("user-cancelled");
     }
-    set({ isRunning: false, currentNodeIds: [], skippedNodeIds: new Set(), _abortController: null });
+    set({ isRunning: false, currentNodeIds: [], _abortController: null });
   },
 
   setMaxConcurrentCalls: (value: number) => {
@@ -1834,8 +1822,6 @@ const workflowStoreImpl: StateCreator<WorkflowStore> = (set, get) => ({
       viewedCommentNodeIds: new Set<string>(),
       // Reset dimmed nodes
       dimmedNodeIds: new Set<string>(),
-      // Reset skipped nodes
-      skippedNodeIds: new Set<string>(),
     });
     get().clearSnapshot();
   },