Refactor: use discards for unused tuple elements

Replaced unused tuple variables with discards (_) in BaseControlPrompt.cs and FileSelectControl.cs to improve code clarity and indicate intentionally ignored values.

Author: FRACerqueira

src/Controls/BaseControlPrompt.cs

@@ -267,11 +267,9 @@ private void RenderBuffer(bool isfinish = false)
                 savedcursor = _bufferScreen.PromptCursor;
 
                 int left = 0;
-                int toprow = 0;
                 int scrolled = 0;
-                LineScreen[] result = [];
-                result = _bufferScreen.DiffBuffer();
-                (left, toprow, scrolled) = ConsolePlus.PreviewCursorPosition(_screenPosition.StartLeft, _screenPosition.StartTop + result[^1].Line);
+                var result = _bufferScreen.DiffBuffer();
+                (left, _, scrolled) = ConsolePlus.PreviewCursorPosition(_screenPosition.StartLeft, _screenPosition.StartTop + result[^1].Line);
 
                 if (scrolled > 0)
                 {

src/Controls/FileSelect/FileSelectControl.cs

@@ -1258,7 +1258,7 @@ private void ExpandFolders(List<string> folders, string localfile)
                 {
                     break;
                 }
-                (string key, bool isload, List<ItemNodeControl<ItemFile>> values) = EnqueueNewitems(_items[index].UniqueId,
+                (string _, bool _, List<ItemNodeControl<ItemFile>> values) = EnqueueNewitems(_items[index].UniqueId,
                     _items[index].Level,
                     _items[index].Value.FullPath);
                 _items[index].IsExpanded = true;