android: send taken receipts only after successful photo or video opening

tools/chatgui-android/app/src/main/java/com/utun/chat/MainActivity.kt

@@ -607,13 +607,13 @@ class MainActivity : AppCompatActivity() {
 
                         videoMessage?.let { msg ->
                             if (msg.filePath.isNotEmpty()) {
-                                VideoPlayerScreen(filePath = msg.filePath, onClose = { videoMessage = null })
+                                VideoPlayerScreen(filePath = msg.filePath, onClose = { videoMessage = null }, onOpened = vm::attachmentOpened)
                             }
                         }
 
                         photoMessage?.let { msg ->
                             if (msg.filePath.isNotEmpty()) {
-                                PhotoViewerScreen(filePath = msg.filePath, onClose = { photoMessage = null })
+                                PhotoViewerScreen(filePath = msg.filePath, onClose = { photoMessage = null }, onOpened = vm::attachmentOpened)
                             }
                         }
 

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

@@ -29,7 +29,7 @@ private const val MAX_DECODE_DIM = 4096
 /** Локальное изображение с EXIF и Fit/zoom; декодирование в IO ограничено стороной 4096 пикселей.
  * Экран владеет Bitmap через Compose; смена пути отменяет доставку старого результата. Ошибка оставляет доступным выход. */
 @Composable
-fun PhotoViewerScreen(filePath: String, onClose: () -> Unit) {
+fun PhotoViewerScreen(filePath: String, onClose: () -> Unit, onOpened: (String) -> Unit = {}) {
     var bmp by remember(filePath) { mutableStateOf<Bitmap?>(null) }
     var loaded by remember(filePath) { mutableStateOf(false) }
     BackHandler(onBack = onClose)
@@ -45,7 +45,10 @@ fun PhotoViewerScreen(filePath: String, onClose: () -> Unit) {
         }
         loaded = true
         if (bmp == null) LogManager.addLog("ERROR", "PhotoViewer", "decode failed: $filePath")
-        else LogManager.addLog("DEBUG", "PhotoViewer", "Opened image ${bmp?.width}x${bmp?.height} path=$filePath")
+        else {
+            LogManager.addLog("DEBUG", "PhotoViewer", "Opened image ${bmp?.width}x${bmp?.height} path=$filePath")
+            onOpened(filePath)
+        }
     }
 
     Box(

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

@@ -63,7 +63,7 @@ private tailrec fun Context.findActivity(): Activity? = when (this) {
  * Controls показывают подтверждённое SDK состояние; zoom/pan и пауза сохраняются при смене размеров Surface.
  * Завершение файла закрывает экран. Ориентация и панели окна восстанавливаются при выходе. */
 @Composable
-fun VideoPlayerScreen(filePath: String, onClose: () -> Unit) {
+fun VideoPlayerScreen(filePath: String, onClose: () -> Unit, onOpened: (String) -> Unit = {}) {
     val completed by rememberUpdatedState(onClose)
     val player = remember(filePath) { VideoFilePlayer { completed() } }
     val playback by player.state.collectAsState()
@@ -71,6 +71,10 @@ fun VideoPlayerScreen(filePath: String, onClose: () -> Unit) {
     val isPlaying = playback.playing
     val durationMs = playback.durationMs
     val positionMs = playback.positionMs
+    var reported by remember(filePath) { mutableStateOf(false) }
+    LaunchedEffect(filePath, playback.prepared, error) {
+        if (playback.prepared && error == null && !reported) { reported = true; onOpened(filePath) }
+    }
     var controlsVisible by remember(filePath) { mutableStateOf(true) }
     var dragging by remember(filePath) { mutableStateOf(false) }
     var dragPosition by remember(filePath) { mutableStateOf(0) }