fix(05-review): WR-05 re-confirm push subscription server-side on health-check mount

apps/pwa/src/hooks/usePushSubscription.ts

@@ -155,6 +155,14 @@ export function usePushSubscription(): UsePushSubscriptionReturn {
         const existingSub = await registration.pushManager.getSubscription()
 
         if (existingSub) {
+          // Re-confirm server-side record (handles 410-prune recovery — D-10).
+          // The upsert on endpoint is idempotent; this is a no-op if the record exists.
+          await fetch('/api/push/subscription', {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            credentials: 'include',
+            body: JSON.stringify(existingSub.toJSON()),
+          }).catch(() => {}) // non-blocking — ignore network failures
           setIsSubscribed(true)
           return
         }