chore(voip): iOS CallKit call-waiting + drop JS callee busy-reject after rebase

- AppDelegate: always prepareIncomingCall with storeEventsForJs true; no hasActiveCall/rejectBusyCall
- MediaSessionInstance: remove single-call JS busy guard; keep requestPhoneStatePermission in startCall

Made-with: Cursor

Author: diegolmello

app/lib/services/voip/MediaSessionInstance.ts

@@ -85,18 +85,6 @@ class MediaSessionInstance {
 
 		this.instance?.on('newCall', ({ call }: { call: IClientMediaCall }) => {
 			if (call && !call.hidden) {
-				if (call.role === 'callee') {
-					// media-signaling emits newCall only when session goes from no call to has call; reject if app is busy with another id.
-					const { call: existingCall, nativeAcceptedCallId } = useCallStore.getState();
-					const activeCallId = existingCall?.callId ?? nativeAcceptedCallId ?? null;
-					if (activeCallId != null && call.callId !== activeCallId) {
-						console.log('[VoIP] Rejecting incoming call — busy with different call:', call.callId);
-						call.reject();
-						RNCallKeep.endCall(call.callId);
-						return;
-					}
-				}
-
 				call.emitter.on('stateChange', oldState => {
 					console.log(`📊 ${oldState} → ${call.state}`);
 					console.log('🤙 [VoIP] New call data:', call);

ios/Libraries/AppDelegate+Voip.swift

@@ -40,12 +40,7 @@ extension AppDelegate: PKPushRegistryDelegate {
       return
     }
 
-    // Check BEFORE reporting — if the user is already on a call, we still must
-    // report to CallKit (PushKit requirement) but will immediately reject it.
-    let isBusy = VoipService.hasActiveCall()
-
-    // Keep DDP + timeout for busy reject, but do not expose this call via getInitialEvents.
-    VoipService.prepareIncomingCall(voipPayload, storeEventsForJs: !isBusy)
+    VoipService.prepareIncomingCall(voipPayload, storeEventsForJs: true)
 
     RNCallKeep.reportNewIncomingCall(
       callId,
@@ -61,11 +56,6 @@ extension AppDelegate: PKPushRegistryDelegate {
       payload: payloadDict,
       withCompletionHandler: {}
     )
-
-    if isBusy {
-      VoipService.rejectBusyCall(voipPayload)
-    }
-
     completion()
   }
 }