[refactor] Extract executionErrorStore from executionStore (#9060)

## Summary
Extracts error-related state and logic from `executionStore` into a
dedicated `executionErrorStore` for better separation of concerns.

## Changes
- **New store**: `executionErrorStore` with all error state
(`lastNodeErrors`, `lastExecutionError`, `lastPromptError`), computed
properties (`hasAnyError`, `totalErrorCount`,
`activeGraphErrorNodeIds`), and UI state (`isErrorOverlayOpen`,
`showErrorOverlay`, `dismissErrorOverlay`)
- **Moved util**: `executionIdToNodeLocatorId` extracted to
`graphTraversalUtil`, reusing `traverseSubgraphPath` and accepting
`rootGraph` as parameter
- **Updated consumers**: 12 files updated to import from
`executionErrorStore`
- **Backward compat**: Deprecated getters retained in `ComfyApp` for
extension compatibility

## Review Focus
- Deprecated getters in `app.ts` — can be removed in a future
breaking-change PR once extension authors migrate

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9060-refactor-Extract-executionErrorStore-from-executionStore-30e6d73d36508101973de835ab6b199f)
by [Unito](https://www.unito.io)

src/renderer/extensions/linearMode/LinearControls.vue

@@ -22,6 +22,7 @@ import { api } from '@/scripts/api'
 import { app } from '@/scripts/app'
 import { useCommandStore } from '@/stores/commandStore'
 import { useExecutionStore } from '@/stores/executionStore'
+import { useExecutionErrorStore } from '@/stores/executionErrorStore'
 import { useQueueSettingsStore } from '@/stores/queueStore'
 import type { SimplifiedWidget } from '@/types/simplifiedWidget'
 import { cn } from '@/utils/tailwindUtil'
@@ -29,6 +30,7 @@ import { cn } from '@/utils/tailwindUtil'
 const { t } = useI18n()
 const commandStore = useCommandStore()
 const executionStore = useExecutionStore()
+const executionErrorStore = useExecutionErrorStore()
 const { batchCount } = storeToRefs(useQueueSettingsStore())
 const settingStore = useSettingStore()
 const { isActiveSubscription } = useBillingContext()
@@ -79,7 +81,7 @@ function nodeToNodeData(node: LGraphNode) {
   return {
     ...nodeData,
     //note lastNodeErrors uses exeuctionid, node.id is execution for root
-    hasErrors: !!executionStore.lastNodeErrors?.[node.id],
+    hasErrors: !!executionErrorStore.lastNodeErrors?.[node.id],
 
     dropIndicator,
     onDragDrop: node.onDragDrop,

src/renderer/extensions/vueNodes/components/LGraphNode.vue

@@ -246,7 +246,7 @@ import { useNodePreviewState } from '@/renderer/extensions/vueNodes/preview/useN
 import { nonWidgetedInputs } from '@/renderer/extensions/vueNodes/utils/nodeDataUtils'
 import { applyLightThemeColor } from '@/renderer/extensions/vueNodes/utils/nodeStyleUtils'
 import { app } from '@/scripts/app'
-import { useExecutionStore } from '@/stores/executionStore'
+import { useExecutionErrorStore } from '@/stores/executionErrorStore'
 import { useNodeOutputStore } from '@/stores/imagePreviewStore'
 import { useRightSidePanelStore } from '@/stores/workspace/rightSidePanelStore'
 import { isTransparent } from '@/utils/colorUtil'
@@ -293,9 +293,9 @@ const isSelected = computed(() => {
 
 const nodeLocatorId = computed(() => getLocatorIdFromNodeData(nodeData))
 const { executing, progress } = useNodeExecutionState(nodeLocatorId)
-const executionStore = useExecutionStore()
+const executionErrorStore = useExecutionErrorStore()
 const hasExecutionError = computed(
-  () => executionStore.lastExecutionErrorNodeId === nodeData.id
+  () => executionErrorStore.lastExecutionErrorNodeId === nodeData.id
 )
 
 const hasAnyError = computed((): boolean => {
@@ -303,7 +303,7 @@ const hasAnyError = computed((): boolean => {
     hasExecutionError.value ||
     nodeData.hasErrors ||
     error ||
-    (executionStore.lastNodeErrors?.[nodeData.id]?.errors.length ?? 0) > 0
+    (executionErrorStore.lastNodeErrors?.[nodeData.id]?.errors.length ?? 0) > 0
   )
 })
 

src/renderer/extensions/vueNodes/components/NodeWidgets.vue

@@ -101,7 +101,7 @@ import {
   stripGraphPrefix,
   useWidgetValueStore
 } from '@/stores/widgetValueStore'
-import { useExecutionStore } from '@/stores/executionStore'
+import { useExecutionErrorStore } from '@/stores/executionErrorStore'
 import type { SimplifiedWidget, WidgetValue } from '@/types/simplifiedWidget'
 import { cn } from '@/utils/tailwindUtil'
 
@@ -116,7 +116,7 @@ const { nodeData } = defineProps<NodeWidgetsProps>()
 const { shouldHandleNodePointerEvents, forwardEventToCanvas } =
   useCanvasInteractions()
 const { bringNodeToFront } = useNodeZIndex()
-const executionStore = useExecutionStore()
+const executionErrorStore = useExecutionErrorStore()
 
 function handleWidgetPointerEvent(event: PointerEvent) {
   if (shouldHandleNodePointerEvents.value) return
@@ -170,7 +170,7 @@ interface ProcessedWidget {
 
 const processedWidgets = computed((): ProcessedWidget[] => {
   if (!nodeData?.widgets) return []
-  const nodeErrors = executionStore.lastNodeErrors?.[nodeData.id ?? '']
+  const nodeErrors = executionErrorStore.lastNodeErrors?.[nodeData.id ?? '']
 
   const nodeId = nodeData.id
   const { widgets } = nodeData