feat: auto-hide media viewer chrome

android/app/src/main/java/ru/daemonlord/messenger/ui/chat/ChatScreen.kt

@@ -2474,6 +2474,9 @@ private fun ChatMediaViewerOverlay(
     var showTopBar by remember { mutableStateOf(true) }
     var dismissProgress by remember { mutableStateOf(0f) }
     val backgroundAlpha = (0.94f - (dismissProgress.coerceIn(0f, 1f) * 0.55f)).coerceIn(0.35f, 0.94f)
+    val toggleChrome: () -> Unit = {
+        showTopBar = !showTopBar
+    }
 
     Surface(
         modifier = Modifier
@@ -2487,8 +2490,8 @@ private fun ChatMediaViewerOverlay(
         ) {
             AnimatedVisibility(
                 visible = showTopBar,
-                enter = fadeIn(),
-                exit = fadeOut(),
+                enter = fadeIn(animationSpec = tween(180)) + slideInVertically(initialOffsetY = { -it / 3 }),
+                exit = fadeOut(animationSpec = tween(120)) + slideOutVertically(targetOffsetY = { -it / 3 }),
             ) {
                 Row(
                     modifier = Modifier
@@ -2518,14 +2521,14 @@ private fun ChatMediaViewerOverlay(
                     ChatViewerMediaType.Image -> ZoomableImageViewerPage(
                         imageUrl = item.url,
                         onDismiss = onDismiss,
-                        onToggleChrome = { showTopBar = !showTopBar },
+                        onToggleChrome = toggleChrome,
                         onDismissProgressChanged = { dismissProgress = it },
                     )
                     ChatViewerMediaType.Video -> VideoViewerPage(
                         videoUrl = item.url,
                         isCurrentPage = pagerState.currentPage == page,
                         onDismiss = onDismiss,
-                        onToggleChrome = { showTopBar = !showTopBar },
+                        onToggleChrome = toggleChrome,
                         onDismissProgressChanged = { dismissProgress = it },
                     )
                 }
@@ -2533,8 +2536,8 @@ private fun ChatMediaViewerOverlay(
 
             AnimatedVisibility(
                 visible = showTopBar && items.getOrNull(pagerState.currentPage)?.reactions?.isNotEmpty() == true,
-                enter = fadeIn(),
-                exit = fadeOut(),
+                enter = fadeIn(animationSpec = tween(180)) + slideInVertically(initialOffsetY = { it / 3 }),
+                exit = fadeOut(animationSpec = tween(120)) + slideOutVertically(targetOffsetY = { it / 3 }),
             ) {
                 Row(
                     modifier = Modifier
@@ -2566,8 +2569,15 @@ private fun ChatMediaViewerOverlay(
 
     LaunchedEffect(pagerState.currentPage) {
         dismissProgress = 0f
+        showTopBar = true
         onPageChanged(pagerState.currentPage)
     }
+
+    LaunchedEffect(showTopBar, pagerState.currentPage) {
+        if (!showTopBar || items.isEmpty()) return@LaunchedEffect
+        delay(2200)
+        showTopBar = false
+    }
 }
 
 @Composable