fix: show video UI when upgrading voice call to video

The call screen used state.callType (set at call initiation) to decide
whether to render video. When a voice call was upgraded to video via
the toggle button, callType remained VOICE so the video grid and local
preview were never shown despite the track being created and sent.

Replace the static isVideoCall check with hasActiveVideo that also
considers isVideoEnabled and the presence of remote video tracks.
Fixes both the full-screen group call UI and the PIP overlay.

https://claude.ai/code/session_015TvWJoAEsfc2ohiRoT9sTr

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/call/CallScreen.kt

@@ -412,7 +412,10 @@ private fun ConnectedCallUI(
     val isAudioMuted by (callController?.isAudioMuted ?: defaultFalse).collectAsState()
     val isVideoEnabled by (callController?.isVideoEnabled ?: defaultTrue).collectAsState()
     val currentAudioRoute by (callController?.audioRoute ?: defaultRoute).collectAsState()
-    val isVideoCall = state.callType == com.vitorpamplona.quartz.nipACWebRtcCalls.tags.CallType.VIDEO
+    val hasActiveVideo =
+        state.callType == com.vitorpamplona.quartz.nipACWebRtcCalls.tags.CallType.VIDEO ||
+            isVideoEnabled ||
+            remoteVideoTracks.isNotEmpty()
 
     var showAddParticipant by remember { mutableStateOf(false) }
 
@@ -439,7 +442,7 @@ private fun ConnectedCallUI(
                 state.allPeerPubKeys - accountViewModel.account.signer.pubKey
             }
 
-        if (isVideoCall) {
+        if (hasActiveVideo) {
             // Video call: always show the peer grid with video for active peers, avatar for inactive
             PeerVideoGrid(
                 peerPubKeys = otherMembers,
@@ -802,7 +805,11 @@ private fun PipConnectedCallUI(
     val activePeerVideos by (callController?.activePeerVideos ?: emptySetFlow).collectAsState()
     val defaultFalse = remember { kotlinx.coroutines.flow.MutableStateFlow(false) }
     val isRemoteVideoActive by (callController?.isRemoteVideoActive ?: defaultFalse).collectAsState()
-    val isVideoCall = state.callType == com.vitorpamplona.quartz.nipACWebRtcCalls.tags.CallType.VIDEO
+    val isVideoEnabled by (callController?.isVideoEnabled ?: defaultFalse).collectAsState()
+    val hasActiveVideo =
+        state.callType == com.vitorpamplona.quartz.nipACWebRtcCalls.tags.CallType.VIDEO ||
+            isVideoEnabled ||
+            remoteVideoTracks.isNotEmpty()
 
     val otherMembers =
         remember(state.allPeerPubKeys) {
@@ -815,8 +822,8 @@ private fun PipConnectedCallUI(
                 .fillMaxSize()
                 .background(Color.Black),
     ) {
-        if (isVideoCall) {
-            // Video call: show first active peer's video or avatar
+        if (hasActiveVideo) {
+            // Video active: show first active peer's video or avatar
             val firstActivePeer = otherMembers.firstOrNull { it in activePeerVideos }
             val activeTrack = firstActivePeer?.let { remoteVideoTracks[it] }
             if (activeTrack != null) {