voice: played bars white, yellow cursor line on waveform

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

@@ -125,23 +125,33 @@ private fun VoiceBubble(message: Message, textColor: Color, onPlay: (String, ()
                 Canvas(modifier = Modifier.weight(1f).height(28.dp)) {
                     val barW = size.width / wfCount
                     val ph = size.height
-                    val playedIdx = if (progress > 0f) (progress * wfCount).toInt() else 0
+                    val playedIdx = if (playing && progress > 0f) (progress * wfCount).toInt() else 0
                     for (i in 0 until wfCount) {
                         val level = wf[i].coerceIn(0f, 1f)
                         val barH = (2f + level * (ph - 2f)).coerceAtMost(ph)
                         val x = i.toFloat() * barW
                         val y = ph - barH
-                        val played = i < playedIdx
+                        val played = playing && i < playedIdx
                         drawRect(
-                            color = if (playing) {
-                                if (played) Color(0xFF3390EC) else Color(0xFF3390EC).copy(alpha = 0.35f)
-                            } else {
-                                Color(0xFFCCCCD4).copy(alpha = 0.8f)
+                            color = when {
+                                played -> Color.White
+                                playing -> Color(0xFFCCCCD4).copy(alpha = 0.8f)
+                                else -> Color(0xFFCCCCD4).copy(alpha = 0.8f)
                             },
                             topLeft = Offset(x, y),
                             size = Size(barW * 0.75f, barH)
                         )
                     }
+                    /* yellow cursor line */
+                    if (playing && progress > 0f && progress < 1f) {
+                        val cursorX = progress * size.width
+                        drawLine(
+                            color = Color(0xFFFFD600),
+                            start = Offset(cursorX, 0f),
+                            end = Offset(cursorX, ph),
+                            strokeWidth = 2.5f
+                        )
+                    }
                 }
             }
         }