fix: show incoming call notification when app is in background

When the app is alive but backgrounded, the relay subscription delivers
the call event first, marking it as consumed. The push notification
path then skips showing the notification because the event is already
consumed. This left the phone ringing with no notification and no way
to bring the app to the foreground.

Now CallController shows the call notification directly when entering
IncomingCall state, regardless of how the event was received. The
notification's fullScreenIntent brings the app to the foreground.

https://claude.ai/code/session_014espsysob7MrE8X8e75jFX

amethyst/src/main/java/com/vitorpamplona/amethyst/service/call/CallController.kt

@@ -24,7 +24,10 @@ import android.content.Context
 import android.content.Intent
 import com.vitorpamplona.amethyst.commons.call.CallManager
 import com.vitorpamplona.amethyst.commons.call.CallState
+import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.service.notifications.NotificationUtils
+import com.vitorpamplona.quartz.nip01Core.core.hexToByteArray
+import com.vitorpamplona.quartz.nip19Bech32.toNpub
 import com.vitorpamplona.quartz.nip59Giftwrap.wraps.GiftWrapEvent
 import com.vitorpamplona.quartz.nipACWebRtcCalls.WebRtcCallFactory
 import com.vitorpamplona.quartz.nipACWebRtcCalls.events.CallIceCandidateEvent
@@ -105,6 +108,7 @@ class CallController(
                 when (state) {
                     is CallState.IncomingCall -> {
                         audioManager.startRinging()
+                        showIncomingCallNotification(state.callerPubKey)
                     }
 
                     is CallState.Offering -> {
@@ -448,4 +452,17 @@ class CallController(
         } catch (_: Exception) {
         }
     }
+
+    private fun showIncomingCallNotification(callerPubKey: String) {
+        val callerUser = LocalCache.getUserIfExists(callerPubKey)
+        val callerName = callerUser?.toBestDisplayName() ?: callerPubKey.take(8) + "..."
+        val uri = "nostr:${callerPubKey.hexToByteArray().toNpub()}"
+
+        NotificationUtils.sendCallNotification(
+            callerName = callerName,
+            callerBitmap = null,
+            uri = uri,
+            applicationContext = context,
+        )
+    }
 }