[backport cloud/1.38] Feat/workspaces 6 billing (#8713)

Backport of #8508 to `cloud/1.38`

Automatically created by manual backport (cherry-pick of
c5431de123).

Conflicts resolved:
-
`src/platform/cloud/subscription/composables/useSubscriptionCredits.test.ts`
— accepted PR version (uses `useBillingContext` mock instead of
pinia/firebase auth)
- `src/services/dialogService.ts` — merged: kept cloud/1.38 eager
imports for dialog components, replaced `TopUpCreditsDialogContent` with
Legacy/Workspace variants, replaced `useSubscription` with
`useBillingContext`, added workspace/legacy component selection in
`showTopUpCreditsDialog`; skipped lazy loader refactor (separate PR, not
part of #8508)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

src/components/actionbar/ComfyRunButton/CloudRunButtonWrapper.vue

@@ -8,10 +8,10 @@
 import { computed } from 'vue'
 
 import ComfyQueueButton from '@/components/actionbar/ComfyRunButton/ComfyQueueButton.vue'
+import { useBillingContext } from '@/composables/billing/useBillingContext'
 import SubscribeToRunButton from '@/platform/cloud/subscription/components/SubscribeToRun.vue'
-import { useSubscription } from '@/platform/cloud/subscription/composables/useSubscription'
 
-const { isActiveSubscription } = useSubscription()
+const { isActiveSubscription } = useBillingContext()
 
 const currentButton = computed(() =>
   isActiveSubscription.value ? ComfyQueueButton : SubscribeToRunButton