RARgames/4gaBoards ? reverse-engineered prompt

Build me a self hosted realtime kanban app for managing projects and tasks. I want a clean dark mode interface with projects, boards, lists, cards, and subtasks, plus the ability to collapse lists and the sidebar so it stays easy to use on wide screens. It should update instantly without reloading, support dragging cards around, and let me edit multiple things at once without losing my changes.

Please include a good markdown editor for card descriptions, import and export for boards, and login with Google, GitHub, Microsoft, or a generic SSO option. Make it multilingual, include shortcuts for power users, and keep the UI simple and uncluttered. If there are parts you need to look up in current docs online, go ahead and do that. Use a modern React app with a Node backend and PostgreSQL, and make it easy to run with Docker.