feat: Enhance screen transition animations and preserve state during navigation for improved user experience

app/src/main/java/com/rosetta/messenger/ui/chats/ChatsListScreen.kt

@@ -14,6 +14,7 @@ import androidx.compose.material.icons.outlined.*
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.runtime.Immutable
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
@@ -194,9 +195,9 @@ fun ChatsListScreen(
     // Status dialog state
     var showStatusDialog by remember { mutableStateOf(false) }
 
-    var visible by remember { mutableStateOf(false) }
-
-    LaunchedEffect(Unit) { visible = true }
+    // 🔥 Используем rememberSaveable чтобы сохранить состояние при навигации
+    // Header сразу visible = true, без анимации при возврате из чата
+    var visible by rememberSaveable { mutableStateOf(true) }
 
     // Dev console dialog - commented out for now
     /*