Fix subscription dialog appearing during onboarding (#6367)

Fixes subscription dialog incorrectly appearing on cloud onboarding
pages (email verification, survey, waitlist). Root cause: logout uses
SPA routing leaving extensions with stale auth state. Solution: (1) use
full page navigation for logout to reset app state, (2) add defensive
route guard to skip subscription checks on /cloud/* paths. Prevents
subscription modal from showing during account switching and onboarding
flows.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6367-Fix-subscription-dialog-appearing-during-onboarding-29b6d73d3650818d88e0d59ade7de02e)
by [Unito](https://www.unito.io)

src/platform/cloud/subscription/composables/useSubscription.ts

@@ -1,4 +1,5 @@
 import { computed, ref, watch } from 'vue'
+import { useRoute } from 'vue-router'
 
 import { useCurrentUser } from '@/composables/auth/useCurrentUser'
 import { useFirebaseAuthActions } from '@/composables/auth/useFirebaseAuthActions'
@@ -108,6 +109,14 @@ export function useSubscription() {
   }
 
   const requireActiveSubscription = async (): Promise<void> => {
+    // DEFENSIVE: Never show subscription dialogs during onboarding flows
+    // All cloud onboarding routes start with '/cloud/' (login, signup, survey, waitlist, etc.)
+    // This prevents subscription enforcement from interfering with user onboarding
+    const route = useRoute()
+    if (route.path.startsWith('/cloud/')) {
+      return
+    }
+
     await fetchSubscriptionStatus()
 
     if (!isActiveSubscription.value) {