One more na update

This update introduces a set of improvements to the NA tool, enhancing its interactive workflows with a new menu for selecting files and actions, first-class time tracking features, and a flexible plugin architecture. Key updates include nil-safe string helpers, multi-select capabilities, and various display enhancements. The plugin system allows users to extend NA with small scripts, promoting flexibility and user-driven customization. Overall, the updates aim to streamline user experience and enhance functionality in managing tasks.