feat(ui): Improve UI layout adaptation for narrow terminals (#5651)

Co-authored-by: Jacob Richman <jacob314@gmail.com>

packages/cli/src/ui/utils/isNarrowWidth.ts

@@ -0,0 +1,9 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+export function isNarrowWidth(width: number): boolean {
+  return width < 80;
+}