fix(android): debounce non-PLAYING poll to suppress UPnP track-change flicker

android/app/src/main/java/com/fabledsword/minstrel/player/MinstrelForwardingPlayer.kt

@@ -53,6 +53,12 @@ class MinstrelForwardingPlayer(
     private val handler = Handler(delegate.applicationLooper)
     private var pollJob: Job? = null
 
+    // Tracks consecutive non-PLAYING poll observations so a single transient
+    // PAUSED_PLAYBACK / STOPPED tick during a Sonos track transition does not
+    // flip the play/pause button. Manual pause still feels instant because it
+    // bypasses the poll entirely via applyTransportPaused().
+    @Volatile private var nonPlayingPollStreak = 0
+
     init {
         scope.launch {
             holder.active.collect { active -> onActiveChanged(active) }
@@ -227,6 +233,7 @@ class MinstrelForwardingPlayer(
 
     private fun onActiveChanged(active: ActiveUpnp?) {
         pollJob?.cancel()
+        nonPlayingPollStreak = 0
         if (active != null) {
             Timber.w("UPnP active: %s -- pollLoop starting", active.routeName)
             // Pause the wrapped ExoPlayer so we are not playing local audio
@@ -278,14 +285,28 @@ class MinstrelForwardingPlayer(
         )
         val transport = active.avTransport.getTransportInfo()
         when (transport.state) {
-            TransportState.PLAYING -> remoteState.applyTransportPlaying()
-            TransportState.PAUSED -> remoteState.applyTransportPaused()
-            TransportState.STOPPED -> remoteState.applyTransportStopped()
+            TransportState.PLAYING -> {
+                nonPlayingPollStreak = 0
+                remoteState.applyTransportPlaying()
+            }
+            TransportState.PAUSED -> {
+                nonPlayingPollStreak += 1
+                if (nonPlayingPollStreak >= NON_PLAYING_CONFIRM) {
+                    remoteState.applyTransportPaused()
+                }
+            }
+            TransportState.STOPPED -> {
+                nonPlayingPollStreak += 1
+                if (nonPlayingPollStreak >= NON_PLAYING_CONFIRM) {
+                    remoteState.applyTransportStopped()
+                }
+            }
             TransportState.TRANSITIONING, TransportState.UNKNOWN -> Unit
         }
     }
 
     private companion object {
         const val POLL_INTERVAL_MS = 1_000L
+        const val NON_PLAYING_CONFIRM = 2
     }
 }