fix(plan): reserve minimum height for selection list in AskUserDialog (#23280)

packages/cli/src/ui/components/AskUserDialog.tsx

@@ -849,11 +849,19 @@ const ChoiceQuestionView: React.FC<ChoiceQuestionViewProps> = ({
     ? Math.max(1, availableHeight - overhead)
     : undefined;
 
+  // Reserve space for at least 3 items if more selectionItems available.
+  const reservedListHeight = Math.min(selectionItems.length * 2, 6);
   const questionHeightLimit =
     listHeight && !isAlternateBuffer
       ? question.unconstrainedHeight
         ? Math.max(1, listHeight - selectionItems.length * 2)
-        : Math.min(15, Math.max(1, listHeight - DIALOG_PADDING))
+        : Math.min(
+            15,
+            Math.max(
+              1,
+              listHeight - Math.max(DIALOG_PADDING, reservedListHeight),
+            ),
+          )
       : undefined;
 
   const maxItemsToShow =