atlassian/pragmatic-drag-and-drop ? reverse-engineered prompt

Build me a fast drag and drop library that works across different front ends, not just one framework. I want a small core that makes the browser’s built in drag and drop safer and easier to use, plus optional pieces for things like a nice drop indicator and better keyboard and screen reader support.

It should be flexible enough for lists, sortable boards, drop zones, and custom drag experiences, and it should feel headless so I can control the look and behavior myself. Make it work well in modern browsers, including mobile, and keep the core lightweight so it only loads what I need.

If there are existing docs or examples for how this is usually used, follow that approach and look up current docs online if you need to.