voice: play button white circle, black icon

tools/chatgui-android/app/src/main/java/com/utun/chat/ui/components/MessageBubble.kt

@@ -105,7 +105,7 @@ private fun VoiceBubble(message: Message, textColor: Color, onPlay: (String, ()
         Row(verticalAlignment = Alignment.CenterVertically) {
             /* Play/Pause button */
             Box(
-                modifier = Modifier.size(32.dp).background(Color(0xFF3390EC), CircleShape)
+                modifier = Modifier.size(32.dp).background(Color.White, CircleShape)
                     .clickable {
                         if (!playing && message.filePath.isNotEmpty()) {
                             playing = true; elapsedMs = 0; progress = 0f
@@ -116,7 +116,7 @@ private fun VoiceBubble(message: Message, textColor: Color, onPlay: (String, ()
                     },
                 contentAlignment = Alignment.Center
             ) {
-                Text(if (playing) "\u23F8" else "\u25B6", fontSize = 14.sp, color = Color.White)
+                Text(if (playing) "\u23F8" else "\u25B6", fontSize = 14.sp, color = Color.Black)
             }
             Spacer(Modifier.width(8.dp))