Keep Android capture ownership until device release and update busy messages

tools/chatgui-android/app/src/main/java/com/utun/chat/data/MicrophoneCapture.kt

@@ -19,9 +19,10 @@ class MicrophoneCapture(private val device: Device, private val log: (String, St
     data class Ptt(val pressed: Boolean) : Event
     private val consumers = mutableListOf<Subscription>()
     @Volatile private var reading = true
+    @Volatile private var disposed = false
     @Volatile private var failure: Exception? = null
     private var worker: Thread? = null
-    val closed: Boolean get() = !reading
+    val closed: Boolean get() = disposed
     val inputId: Int? get() = device.inputId
     val channels: Int get() = device.channels
 
@@ -83,6 +84,7 @@ class MicrophoneCapture(private val device: Device, private val log: (String, St
         if (!last) return
         try { device.stop() } catch (e: Exception) { log("WARN", "capture stop failed: ${e.message}") }
         worker?.join()
-        try { device.close() } finally { released() }
+        try { device.close() } catch (e: Exception) { log("ERROR", "capture release failed: ${e.message}") }
+        finally { disposed = true; released() }
     }
 }