fix: Update CustomNodesManager command to use tri-state manager system

Replace legacy isLegacyManagerUI() call with new ManagerUIState system:
- Use useManagerStateStore().managerUIState instead of async API call
- Handle DISABLED state by showing settings dialog
- Handle LEGACY_UI state with fallback to new UI on error
- Handle NEW_UI state by showing manager dialog
- Remove unused useComfyManagerService import

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

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

src/composables/useCoreCommands.ts

@@ -16,7 +16,6 @@ import {
 import { Point } from '@/lib/litegraph/src/litegraph'
 import { api } from '@/scripts/api'
 import { app } from '@/scripts/app'
-import { useComfyManagerService } from '@/services/comfyManagerService'
 import { useDialogService } from '@/services/dialogService'
 import { useLitegraphService } from '@/services/litegraphService'
 import { useWorkflowService } from '@/services/workflowService'
@@ -744,26 +743,33 @@ export function useCoreCommands(): ComfyCommand[] {
       label: 'Custom Nodes Manager',
       versionAdded: '1.12.10',
       function: async () => {
-        const { is_legacy_manager_ui } =
-          (await useComfyManagerService().isLegacyManagerUI()) ?? {}
+        const managerState = useManagerStateStore().managerUIState
 
-        if (is_legacy_manager_ui === true) {
-          try {
-            await useCommandStore().execute(
-              'Comfy.Manager.Menu.ToggleVisibility' // This command is registered by legacy manager FE extension
-            )
-          } catch (error) {
-            console.error('error', error)
-            useToastStore().add({
-              severity: 'error',
-              summary: t('g.error'),
-              detail: t('manager.legacyMenuNotAvailable'),
-              life: 3000
-            })
+        switch (managerState) {
+          case ManagerUIState.DISABLED:
+            dialogService.showSettingsDialog('extension')
+            break
+
+          case ManagerUIState.LEGACY_UI:
+            try {
+              await useCommandStore().execute(
+                'Comfy.Manager.Menu.ToggleVisibility' // This command is registered by legacy manager FE extension
+              )
+            } catch (error) {
+              console.error('error', error)
+              useToastStore().add({
+                severity: 'error',
+                summary: t('g.error'),
+                detail: t('manager.legacyMenuNotAvailable'),
+                life: 3000
+              })
+              dialogService.showManagerDialog()
+            }
+            break
+
+          case ManagerUIState.NEW_UI:
             dialogService.showManagerDialog()
-          }
-        } else {
-          dialogService.showManagerDialog()
+            break
         }
       }
     },