subscription page (#6064)

Summary

Implements cloud subscription management UI and flow for ComfyUI Cloud
users.

  Core Features:
- Subscription Status Tracking: Global reactive state management for
subscription status across all components
  using shared subscriptionStatus ref
- Subscribe to Run Button: Replaces the Run button in the actionbar with
a "Subscribe to Run" button for users
  without active subscriptions
- Subscription Required Dialog: Modal dialog with subscription benefits,
pricing, and checkout flow with video
  background
- Subscription Settings Panel: New settings panel showing subscription
status, renewal date, and quick access to
  billing management
- Auto-detection & Polling: Automatically polls subscription status
after checkout completion and syncs state
  across the application


https://github.com/user-attachments/assets/f41b8e6a-5845-48a7-8169-3a6fc0d2e5c8



┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6064-subscription-page-28d6d73d36508135a2a0fe7c94b40852)
by [Unito](https://www.unito.io)

---------

Co-authored-by: GitHub Action <action@github.com>

src/extensions/core/cloudSubscription.ts

@@ -0,0 +1,24 @@
+import { watch } from 'vue'
+
+import { useCurrentUser } from '@/composables/auth/useCurrentUser'
+import { useSubscription } from '@/platform/cloud/subscription/composables/useSubscription'
+import { useExtensionService } from '@/services/extensionService'
+
+useExtensionService().registerExtension({
+  name: 'Comfy.CloudSubscription',
+
+  setup: async () => {
+    const { isLoggedIn } = useCurrentUser()
+    const { requireActiveSubscription } = useSubscription()
+
+    const checkSubscriptionStatus = () => {
+      if (!isLoggedIn.value) return
+
+      void requireActiveSubscription()
+    }
+
+    watch(() => isLoggedIn.value, checkSubscriptionStatus, {
+      immediate: true
+    })
+  }
+})

src/extensions/core/index.ts

@@ -26,4 +26,5 @@ import './widgetInputs'
 
 if (isCloud) {
   import('./cloudBadge')
+  import('./cloudSubscription')
 }