XZB-1248/Spark ? reverse-engineered prompt

Build me a browser based remote management app for my own devices that works on Windows, Linux, and Mac. I want a central web dashboard where I can see connected machines, view system info, monitor desktop screenshots, open a terminal, browse files, upload and download files, edit text files, and manage running processes. It should also show basic network activity and let me safely shut down, reboot, lock, sleep, or log off devices when the operating system supports it.

Please make it feel polished and easy to use, with a clean modern UI and clear status indicators for online devices. I’d like simple login protection, configurable server settings, and a client that connects back only to my server. Use the README and API docs as the source of truth, and look up current docs online if you need to. Keep it cross platform and make sure the web interface is usable from any browser.