fix: skip loading drafts when Comfy.Workflow.Persist is disabled (#8851)

## Summary

Skip draft loading and clear stored drafts when `Comfy.Workflow.Persist`
is disabled, preventing unsaved changes from reappearing.

## Changes

- **What**: Guard draft loading in `ComfyWorkflow.load()` with
`Comfy.Workflow.Persist` setting check. Clear all localStorage drafts
when Persist is toggled from true to false.

## Review Focus

`ComfyWorkflow.load()` previously read drafts unconditionally regardless
of the Persist setting. This meant that after disabling Persist,
previously stored drafts would still be applied when opening a saved
workflow. The fix adds a guard in two places:
1. `comfyWorkflow.ts`: `load()` now checks `Comfy.Workflow.Persist`
before calling `getDraft()`
2. `useWorkflowPersistence.ts`: A `watch` on the Persist setting calls
`draftStore.reset()` when disabled

Fixes Comfy-Org/ComfyUI#12323

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8851-fix-skip-loading-drafts-when-Comfy-Workflow-Persist-is-disabled-3066d73d36508119ac2ce13564e18c01)
by [Unito](https://www.unito.io)

Co-authored-by: Amp <amp@ampcode.com>

src/platform/workflow/management/stores/comfyWorkflow.ts

@@ -62,8 +62,11 @@ export class ComfyWorkflow extends UserFile {
   > {
     const { useWorkflowDraftStore } =
       await import('@/platform/workflow/persistence/stores/workflowDraftStore')
+    const { useSettingStore } = await import('@/platform/settings/settingStore')
     const draftStore = useWorkflowDraftStore()
-    let draft = !force ? draftStore.getDraft(this.path) : undefined
+    const persistEnabled = useSettingStore().get('Comfy.Workflow.Persist')
+    let draft =
+      !force && persistEnabled ? draftStore.getDraft(this.path) : undefined
     let draftState: ComfyWorkflowJSON | null = null
     let draftContent: string | null = null
 

src/platform/workflow/persistence/composables/useWorkflowPersistence.test.ts

@@ -1,6 +1,7 @@
 import { createTestingPinia } from '@pinia/testing'
 import { setActivePinia } from 'pinia'
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { nextTick } from 'vue'
 import type * as I18n from 'vue-i18n'
 
 import { useWorkflowStore } from '@/platform/workflow/management/stores/workflowStore'
@@ -10,15 +11,25 @@ import { useWorkflowDraftStore } from '@/platform/workflow/persistence/stores/wo
 import { defaultGraphJSON } from '@/scripts/defaultGraph'
 import { setStorageValue } from '@/scripts/utils'
 
-vi.mock('@/platform/settings/settingStore', () => ({
-  useSettingStore: vi.fn(() => ({
-    get: vi.fn((key: string) =>
-      key === 'Comfy.Workflow.Persist' ? true : undefined
-    ),
-    set: vi.fn()
-  }))
+const settingMocks = vi.hoisted(() => ({
+  persistRef: null as { value: boolean } | null
 }))
 
+vi.mock('@/platform/settings/settingStore', async () => {
+  const { ref } = await import('vue')
+  settingMocks.persistRef = ref(true)
+  return {
+    useSettingStore: vi.fn(() => ({
+      get: vi.fn((key: string) => {
+        if (key === 'Comfy.Workflow.Persist')
+          return settingMocks.persistRef!.value
+        return undefined
+      }),
+      set: vi.fn()
+    }))
+  }
+})
+
 const mockToastAdd = vi.fn()
 vi.mock('primevue', () => ({
   useToast: () => ({
@@ -114,6 +125,7 @@ describe('useWorkflowPersistence', () => {
     localStorage.clear()
     sessionStorage.clear()
     vi.clearAllMocks()
+    settingMocks.persistRef!.value = true
     mockToastAdd.mockClear()
     useWorkflowDraftStore().reset()
     mocks.state.graphChangedHandler = null
@@ -253,4 +265,25 @@ describe('useWorkflowPersistence', () => {
       })
     )
   })
+
+  it('clears all drafts when Persist is switched from true to false', async () => {
+    const workflowStore = useWorkflowStore()
+    const draftStore = useWorkflowDraftStore()
+    const workflow = workflowStore.createTemporary('ClearDraft.json')
+    await workflowStore.openWorkflow(workflow)
+
+    useWorkflowPersistence()
+    expect(mocks.state.graphChangedHandler).toBeTypeOf('function')
+
+    mocks.state.currentGraph = { title: 'Draft to clear' }
+    mocks.state.graphChangedHandler!()
+    await vi.advanceTimersByTimeAsync(800)
+
+    expect(draftStore.getDraft('workflows/ClearDraft.json')).toBeDefined()
+
+    settingMocks.persistRef!.value = false
+    await nextTick()
+
+    expect(draftStore.getDraft('workflows/ClearDraft.json')).toBeUndefined()
+  })
 })

src/platform/workflow/persistence/composables/useWorkflowPersistence.ts

@@ -53,6 +53,13 @@ export function useWorkflowPersistence() {
 
   const lastSavedJsonByPath = ref<Record<string, string>>({})
 
+  watch(workflowPersistenceEnabled, (enabled) => {
+    if (!enabled) {
+      workflowDraftStore.reset()
+      lastSavedJsonByPath.value = {}
+    }
+  })
+
   const persistCurrentWorkflow = () => {
     if (!workflowPersistenceEnabled.value) return
     const activeWorkflow = workflowStore.activeWorkflow