magicmirrororg/magicmirror ? reverse-engineered prompt

Build me a modular smart mirror app that I can run on a wall mounted display and use like a personal assistant.

It should show useful things like the time, weather, calendar events, news, and any extra widgets I add later. I want it to be easy to customize, so I can turn modules on and off, arrange them on the screen, and add my own modules without having to rebuild everything. Please make it feel clean and polished, with a simple fullscreen mirror style, and let it run as a desktop app so I do not need to mess with a separate web server.

If you need to check current setup details or best practices, look up the latest docs online and follow them. Also include a straightforward way to configure the app for my own room and make sure it is easy to update and maintain.