chahinebrini fb2d90b947 fix(calls): no duplicate incoming-call notifications
- backend: skip Expo alert push to iOS devices that already received VoIP push
  (CallKit + banner = double ring)
- native: receiveIncoming no longer triggers InCallManager.startRingtone —
  CallKit/ConnectionService play their own ring. Dedup if same callId
  arrives twice (Realtime + VoIP-Push race).
2026-06-04 18:28:00 +02:00
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