CustomPurchaseControllerProvider onPurchase not called on cold boot - purchase hangs with spinner #157
Description
Summary
CustomPurchaseControllerProvider's onPurchase handler is never called on cold boot. The purchase button shows a spinner indefinitely and the native StoreKit popup never appears. After hot reload/refresh, everything works perfectly.
Environment
expo-superwall: 1.0.1
Expo SDK: [53.0.22]
Platform: iOS
React Native: [0.79.4]
Behavior
Cold Boot (❌ Broken):
User clicks purchase button on paywall
Spinner appears and spins forever
Native StoreKit purchase popup never appears
onPurchase handler never called
No Superwall events logged via useSuperwallEvents
After Refresh/Hot Reload (✅ Works):
User clicks purchase button
Native StoreKit popup appears immediately
onPurchase handler called correctly
All Superwall events fire properly
Purchase completes successfully
Reproduction Steps
Set up CustomPurchaseControllerProvider with onPurchase handler
Force quit app completely
Launch app fresh (cold boot)
Open paywall and click purchase button
Result: Spinner hangs, onPurchase never called
Refresh app (⌘R) without force quit
Click purchase again
Result: Works perfectly
Root Cause
On cold boot, useSuperwallEvents (which CustomPurchaseControllerProvider uses internally) doesn't receive ANY events from native Superwall - not even paywallOpen or transactionStart. The native-to-JS event bridge appears to not initialize properly on first launch.
Reproducible in Example App
This issue can be reproduced in the official expo-superwall example app.