Refactor and modernise Moodle’s Repository, File Picker, and File Manager components to improve usability, performance, and long-term maintainability.

This includes replacing outdated YUI3 code with modern JavaScript, streamlining the UI for more intuitive file selection and management, and enhancing the underlying APIs to support richer integrations with third-party content sources.

The outcome is a faster, more consistent content handling experience across Moodle, enabling smoother workflows for educators, better accessibility, and easier plugin development for integrators.