fix: hide assets sidebar badge when legacy queue is enabled (#8708)

### Motivation
- The Assets sidebar shows a notification-style badge immediately when a
job is queued using the legacy queue, which is misleading because that
badge is intended for the newer Queue Panel V2 experience.

### Description
- Gate the Assets sidebar `iconBadge` on the `Comfy.Queue.QPOV2` setting
by importing `useSettingStore` and returning `null` when QPO V2 is
disabled; otherwise show `pendingTasks.length` as before
(`src/composables/sidebarTabs/useAssetsSidebarTab.ts`).
- Add a focused unit test that mocks the settings and queue store to
verify the badge is hidden when QPO V2 is disabled and shows the pending
count when enabled
(`src/composables/sidebarTabs/useAssetsSidebarTab.test.ts`).
- Keep the Assets component import mocked in the test to avoid
bootstrapping the full UI during unit runs.

### Testing
- Ran the new unit test with `pnpm vitest
src/composables/sidebarTabs/useAssetsSidebarTab.test.ts` and it passed
(2 tests).
- Ran type checking with `pnpm typecheck` and it completed successfully.
- Ran linting with `pnpm lint` and no errors were reported.

------
[Codex
Task](https://chatgpt.com/codex/tasks/task_e_69867f4ceaac8330b9806d5b51006a6a)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8708-fix-hide-assets-sidebar-badge-when-legacy-queue-is-enabled-3006d73d3650818eb809de399583088e)
by [Unito](https://www.unito.io)

src/composables/sidebarTabs/useAssetsSidebarTab.test.ts

@@ -0,0 +1,46 @@
+import { describe, expect, it, vi } from 'vitest'
+
+import { useAssetsSidebarTab } from '@/composables/sidebarTabs/useAssetsSidebarTab'
+
+const { mockGetSetting, mockPendingTasks } = vi.hoisted(() => ({
+  mockGetSetting: vi.fn(),
+  mockPendingTasks: [] as unknown[]
+}))
+
+vi.mock('@/platform/settings/settingStore', () => ({
+  useSettingStore: () => ({
+    get: mockGetSetting
+  })
+}))
+
+vi.mock('@/components/sidebar/tabs/AssetsSidebarTab.vue', () => ({
+  default: {}
+}))
+
+vi.mock('@/stores/queueStore', () => ({
+  useQueueStore: () => ({
+    pendingTasks: mockPendingTasks
+  })
+}))
+
+describe('useAssetsSidebarTab', () => {
+  it('hides icon badge when QPO V2 is disabled', () => {
+    mockGetSetting.mockReturnValue(false)
+    mockPendingTasks.splice(0, mockPendingTasks.length, {}, {})
+
+    const sidebarTab = useAssetsSidebarTab()
+
+    expect(typeof sidebarTab.iconBadge).toBe('function')
+    expect((sidebarTab.iconBadge as () => string | null)()).toBeNull()
+  })
+
+  it('shows pending task count when QPO V2 is enabled', () => {
+    mockGetSetting.mockReturnValue(true)
+    mockPendingTasks.splice(0, mockPendingTasks.length, {}, {}, {})
+
+    const sidebarTab = useAssetsSidebarTab()
+
+    expect(typeof sidebarTab.iconBadge).toBe('function')
+    expect((sidebarTab.iconBadge as () => string | null)()).toBe('3')
+  })
+})

src/composables/sidebarTabs/useAssetsSidebarTab.ts

@@ -1,6 +1,7 @@
 import { markRaw } from 'vue'
 
 import AssetsSidebarTab from '@/components/sidebar/tabs/AssetsSidebarTab.vue'
+import { useSettingStore } from '@/platform/settings/settingStore'
 import { useQueueStore } from '@/stores/queueStore'
 import type { SidebarTabExtension } from '@/types/extensionTypes'
 
@@ -14,6 +15,12 @@ export const useAssetsSidebarTab = (): SidebarTabExtension => {
     component: markRaw(AssetsSidebarTab),
     type: 'vue',
     iconBadge: () => {
+      const settingStore = useSettingStore()
+
+      if (!settingStore.get('Comfy.Queue.QPOV2')) {
+        return null
+      }
+
       const queueStore = useQueueStore()
       return queueStore.pendingTasks.length > 0
         ? queueStore.pendingTasks.length.toString()