Fix common Alaznah Calling integration issues.

Troubleshooting

Symptom	Likely fix
`Unable to resolve module` / Metro path errors	Rebuild; clear Metro cache (`--reset-cache`); ensure peers installed
Native module missing / null	Rebuild the binary; Expo Go unsupported
Cannot connect	Reachable `signalingUrl`; device cannot use your laptop `localhost` without a tunnel
Auth / 401	Token `userId` must match `config.userId`; mint a fresh token
No audio	Mic permission; check mute on both peers; physical device preferred
Black / no video	Camera permission; `mediaType: 'video'`; check `videoEnabled`
One-way media	Firewall / ICE — try `iceTransportPolicy: 'relay'` with working TURN
No ring in background	Console push credentials + `registerPushToken` + OS permissions
JS incoming flashes after native Accept	Call `drainNativeIncomingAction()` then `syncPendingCalls()` on `AppState` active
Accept “does nothing” on tap	By design — swipe up on the green control
Duplicate native + JS incoming	`setNativeIncomingSuppressed(true)` while in-app calling UI is mounted
iOS simulator CallKit crash	Do not enable CallKeep / CallKit paths that disallow simulator

Still stuck?

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