Add apache2 SPDX headers to all source files (#48)

packages/cli/src/ui/components/messages/ToolConfirmationMessage.tsx

@@ -1,3 +1,9 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
 import React from 'react';
 import { Box, Text, useInput } from 'ink';
 import SelectInput from 'ink-select-input';