voice: fix waveform — pointerInput on Box, cursor + white bars stay on pause

- Canvas pointerInput moved to wrapping Box (state updates trigger recomposition)
- showCursor = playing || paused (cursor and white bars visible on pause)
- elapsed/dur stays visible on pause too

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

@@ -129,36 +129,39 @@ private fun VoiceBubble(message: Message, textColor: Color,
 
             /* Waveform with seek on tap */
             if (wfCount >= 2) {
-                Canvas(modifier = Modifier.weight(1f).height(28.dp)
-                    .pointerInput(message.filePath) {
-                        detectTapGestures { offset ->
-                            if (message.filePath.isEmpty()) return@detectTapGestures
-                            val seekFrac = (offset.x / size.width).coerceIn(0f, 1f)
-                            val seekMs = (seekFrac * durMs).toInt()
-                            playing = true; paused = false; elapsedMs = seekMs; progress = seekFrac
-                            onSeek(message.filePath, seekMs, onDone)
+                Box(
+                    modifier = Modifier.weight(1f).height(28.dp)
+                        .pointerInput(message.filePath) {
+                            detectTapGestures { offset ->
+                                if (message.filePath.isEmpty()) return@detectTapGestures
+                                val seekFrac = (offset.x / size.width).coerceIn(0f, 1f)
+                                val seekMs = (seekFrac * durMs).toInt()
+                                playing = true; paused = false; elapsedMs = seekMs; progress = seekFrac
+                                onSeek(message.filePath, seekMs, onDone)
+                            }
                         }
-                    }
                 ) {
-                    val barW = size.width / wfCount
-                    val ph = size.height
-                    val showCursor = playing && !paused
-                    val playedIdx = if (showCursor && 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 = showCursor && i < playedIdx
-                        drawRect(
-                            color = when { played -> Color.White; else -> Color(0xFFCCCCD4).copy(alpha = 0.8f) },
-                            topLeft = Offset(x, y),
-                            size = Size(barW * 0.75f, barH)
-                        )
-                    }
-                    if (showCursor && progress > 0f && progress < 1f) {
-                        val cursorX = progress * size.width
-                        drawLine(Color(0xFFFFD600), Offset(cursorX, 0f), Offset(cursorX, ph), strokeWidth = 2.5f)
+                    Canvas(modifier = Modifier.fillMaxSize()) {
+                        val barW = size.width / wfCount
+                        val ph = size.height
+                        val showCursor = playing || paused
+                        val playedIdx = if (showCursor && 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 = showCursor && i < playedIdx
+                            drawRect(
+                                color = when { played -> Color.White; else -> Color(0xFFCCCCD4).copy(alpha = 0.8f) },
+                                topLeft = Offset(x, y),
+                                size = Size(barW * 0.75f, barH)
+                            )
+                        }
+                        if (showCursor && progress > 0f && progress < 1f) {
+                            val cursorX = progress * size.width
+                            drawLine(Color(0xFFFFD600), Offset(cursorX, 0f), Offset(cursorX, ph), strokeWidth = 2.5f)
+                        }
                     }
                 }
             }
@@ -173,7 +176,7 @@ private fun VoiceBubble(message: Message, textColor: Color,
             verticalAlignment = Alignment.Bottom
         ) {
             Text(
-                if (playing && !paused) "${formatDurationMs(elapsedMs)} / ${formatDurationMs(durMs)}"
+                if (playing || paused) "${formatDurationMs(elapsedMs)} / ${formatDurationMs(durMs)}"
                 else formatDurationMs(durMs),
                 fontSize = 12.sp,
                 color = textColor.copy(alpha = 0.55f)