feat: Hide keyboard when entering selection mode in ChatDetailScreen

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

@@ -290,6 +290,14 @@ fun ChatDetailScreen(
     var selectedMessages by remember { mutableStateOf<Set<String>>(emptySet()) }
     val isSelectionMode = selectedMessages.isNotEmpty()
     
+    // 🔥 Закрываем клавиатуру когда открывается selection mode (action bar с Reply/Forward)
+    LaunchedEffect(isSelectionMode) {
+        if (isSelectionMode) {
+            keyboardController?.hide()
+            focusManager.clearFocus()
+        }
+    }
+
     // 🔥 Закрытие экрана
     val hideKeyboardAndBack: () -> Unit = {
         keyboardController?.hide()