fix: re render context usage indicator (#5102)

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

@@ -0,0 +1,25 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { Text } from 'ink';
+import { Colors } from '../colors.js';
+import { tokenLimit } from '@google/gemini-cli-core';
+
+export const ContextUsageDisplay = ({
+  promptTokenCount,
+  model,
+}: {
+  promptTokenCount: number;
+  model: string;
+}) => {
+  const percentage = promptTokenCount / tokenLimit(model);
+
+  return (
+    <Text color={Colors.Gray}>
+      ({((1 - percentage) * 100).toFixed(0)}% context left)
+    </Text>
+  );
+};