kde/dolphin — reverse-engineered prompt

Build me a polished Linux desktop file manager in the spirit of KDE Dolphin. I want it to be easy to browse folders on my computer and on removable media like USB sticks and SD cards, and make everyday tasks like creating folders, copying, moving, renaming, and deleting files feel fast and obvious.

Please keep the design very usability focused. It should feel clean and approachable for normal people who understand files and folders, not just power users, but it should still have some deeper features as long as they stay out of the way. An optional embedded terminal is a good example of that kind of feature.

I want something full featured without feeling cluttered, with sensible defaults and only the options that really help. Make sure it feels like a real desktop app, not a rough prototype. If there are project docs or current upstream notes you should check online while wiring it up, go ahead and use them.