[refactor] replace provide/inject with direct store ref access - addresses @DrJKL's architecture feedback

Replace the provide/inject pattern for execution errors with direct store access as suggested.
Components now use executionStore.currentErrorNodeId computed ref directly, eliminating
boilerplate and improving performance with a single source of truth.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/components/graph/GraphCanvas.vue

@@ -47,11 +47,6 @@
       :size="nodeSizes.get(nodeData.id)"
       :readonly="false"
       :executing="executionStore.executingNodeId === nodeData.id"
-      :error="
-        executionStore.lastExecutionError?.node_id === nodeData.id
-          ? 'Execution error'
-          : null
-      "
       :zoom-level="canvasStore.canvas?.ds?.scale || 1"
       :data-node-id="nodeData.id"
       @node-click="handleNodeSelect"

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

@@ -13,7 +13,7 @@
         // border
         'border border-solid border-sand-100 dark-theme:border-charcoal-300',
         !!executing && 'border-blue-500 dark-theme:border-blue-500',
-        !!(error || nodeData.hasErrors) && 'border-error',
+        !!hasAnyError && 'border-error',
         // hover
         'hover:ring-7 ring-gray-500/50 dark-theme:ring-gray-500/20',
         // Selected
@@ -21,7 +21,7 @@
         !!isSelected && 'outline-black dark-theme:outline-white',
         !!(isSelected && executing) &&
           'outline-blue-500 dark-theme:outline-blue-500',
-        !!(isSelected && (error || nodeData.hasErrors)) && 'outline-error',
+        !!(isSelected && hasAnyError) && 'outline-error',
         {
           'animate-pulse': executing,
           'opacity-50': nodeData.mode === 4,
@@ -134,6 +134,7 @@ import { LiteGraph } from '@/lib/litegraph/src/litegraph'
 import { SelectedNodeIdsKey } from '@/renderer/core/canvas/injectionKeys'
 import { useNodeLayout } from '@/renderer/extensions/vueNodes/layout/useNodeLayout'
 import { LODLevel, useLOD } from '@/renderer/extensions/vueNodes/lod/useLOD'
+import { useExecutionStore } from '@/stores/executionStore'
 import { cn } from '@/utils/tailwindUtil'
 
 import { useVueElementTracking } from '../composables/useVueNodeResizeTracking'
@@ -151,7 +152,6 @@ interface LGraphNodeProps {
   readonly?: boolean
   executing?: boolean
   progress?: number
-  error?: string | null
   zoomLevel?: number
 }
 
@@ -176,6 +176,17 @@ const emit = defineEmits<{
 
 useVueElementTracking(props.nodeData.id, 'node')
 
+// Execution error state from store (direct ref access as suggested by @DrJKL)
+const executionStore = useExecutionStore()
+const hasExecutionError = computed(
+  () => executionStore.currentErrorNodeId === props.nodeData.id
+)
+
+// Computed error states for styling
+const hasAnyError = computed(
+  (): boolean => hasExecutionError.value || !!props.nodeData.hasErrors
+)
+
 // Inject selection state from parent
 const selectedNodeIds = inject(SelectedNodeIdsKey)
 if (!selectedNodeIds) {

src/stores/executionStore.ts

@@ -407,6 +407,20 @@ export const useExecutionStore = defineStore('execution', () => {
     return executionId
   }
 
+  const lastExecutionErrorNodeLocatorId = computed(() => {
+    const err = lastExecutionError.value
+    if (!err) return null
+    return executionIdToNodeLocatorId(String(err.node_id))
+  })
+
+  // Computed ref for current error node ID - components can use this directly
+  const currentErrorNodeId = computed<string | null>(() => {
+    const locator = lastExecutionErrorNodeLocatorId.value
+    if (!locator) return null
+    const localId = workflowStore.nodeLocatorIdToNodeId(locator)
+    return localId != null ? String(localId) : null
+  })
+
   return {
     isIdle,
     clientId,
@@ -426,6 +440,10 @@ export const useExecutionStore = defineStore('execution', () => {
      * The error from the previous execution.
      */
     lastExecutionError,
+    /**
+     * NodeLocatorId for the most recent execution error.
+     */
+    lastExecutionErrorNodeLocatorId,
     /**
      * The id of the node that is currently being executed (backward compatibility)
      */
@@ -470,6 +488,10 @@ export const useExecutionStore = defineStore('execution', () => {
     _executingNodeProgress,
     // NodeLocatorId conversion helpers
     executionIdToNodeLocatorId,
-    nodeLocatorIdToExecutionId
+    nodeLocatorIdToExecutionId,
+    /**
+     * The node ID that currently has an execution error (as string)
+     */
+    currentErrorNodeId
   }
 })