fix: seekVersion forces LaunchedEffect restart on seek/resume

When playing=true and seek happens, LaunchedEffect(playing) key didn't change,
so the elapsed timer kept using the old start time. Added seekVersion counter
as second key — increments on waveform tap and play/resume click, forcing
the timer coroutine to restart with the new elapsedMs position.

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

@@ -88,6 +88,7 @@ private fun VoiceBubble(message: Message, textColor: Color,
     val durMs = message.voiceDurationMs
     var playing by remember { mutableStateOf(false) }
     var paused by remember { mutableStateOf(false) }
+    var seekVersion by remember { mutableStateOf(0) }
     var elapsedMs by remember { mutableStateOf(0) }
     var progress by remember { mutableStateOf(0f) }
 
@@ -95,7 +96,7 @@ private fun VoiceBubble(message: Message, textColor: Color,
     val onPaused = remember { { paused = true; playing = false } }
 
     /* elapsed timer while playing */
-    LaunchedEffect(playing) {
+    LaunchedEffect(playing, seekVersion) {
         if (playing && !paused) {
             val start = System.currentTimeMillis() - elapsedMs
             while (playing && !paused) {
@@ -116,6 +117,7 @@ private fun VoiceBubble(message: Message, textColor: Color,
                             if (playing && !paused) {
                                 onPlay(message.filePath, onDone, onPaused)
                             } else {
+                                seekVersion++
                                 playing = true; paused = false
                                 onPlay(message.filePath, onDone, onPaused)
                             }
@@ -136,6 +138,7 @@ private fun VoiceBubble(message: Message, textColor: Color,
                                 if (message.filePath.isEmpty()) return@detectTapGestures
                                 val seekFrac = (offset.x / size.width).coerceIn(0f, 1f)
                                 val seekMs = (seekFrac * durMs).toInt()
+                                seekVersion++
                                 playing = true; paused = false; elapsedMs = seekMs; progress = seekFrac
                                 onSeek(message.filePath, seekMs, onDone)
                             }