Keep replacement camera preview active during tile disposal

tools/chatgui-android/app/src/main/java/com/utun/chat/ui/screens/StreamScreen.kt

@@ -424,7 +424,8 @@ internal fun StreamPreviewPlayback(localPreview: StreamPreview, displayDegrees:
             if (event == Lifecycle.Event.ON_STOP) { localPreview.setVisible(false); visible = false }
         }
         owner.lifecycle.addObserver(observer)
-        onDispose { owner.lifecycle.removeObserver(observer); localPreview.setVisible(false) }
+        // onRelease отсоединяет только свой target; поздний dispose плитки не должен выключить новый preview.
+        onDispose { owner.lifecycle.removeObserver(observer) }
     }
     if (visible) key(localPreview) {
         AndroidView(factory = { CameraPreviewView(it, localPreview) }, modifier = modifier,