refactor: improve status bar handling in ChatDetailScreen and ChatsListScreen

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

@@ -221,8 +221,12 @@ fun ChatDetailScreen(
 
         DisposableEffect(Unit) {
                 onDispose {
-                        // Восстановить при уходе с экрана
-                        SystemBarsStyleUtils.applyChatStatusBar(window, view, isDarkTheme)
+                        // Восстановить белые иконки статус-бара для chat list header
+                        if (window != null && view != null) {
+                                val ic = androidx.core.view.WindowCompat.getInsetsController(window, view)
+                                window.statusBarColor = android.graphics.Color.TRANSPARENT
+                                ic.isAppearanceLightStatusBars = false
+                        }
                 }
         }
 

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

@@ -224,8 +224,7 @@ fun ChatsListScreen(
                 focusManager.clearFocus()
         }
 
-        // Update status bar appearance — only set once on entry, not every recomposition
-        // This prevents overriding ChatDetailScreen's status bar when ChatsListScreen is in back stack
+        // Update status bar appearance
         DisposableEffect(isDarkTheme) {
                 val window = (view.context as android.app.Activity).window
                 val insetsController =