lukeisham/sputnik ? reverse-engineered prompt

Build me a native macOS writing and dev workspace called Sputnik.

I want a simple, focused app that keeps six views working together in one window, a project file tree, a text editor for Markdown, HTML, ASCII art, and JSON, a live Markdown preview, a PDF viewer, a live HTML preview, and an integrated Zsh terminal. The editor and previews should stay synchronized where that makes sense, and the whole thing should feel clean, minimal, and fast.

It should be crash resistant, memory efficient, and good for long focused sessions with AI assisted work. Add helpful in app guidance so it is easy to understand right away, and make the layout feel polished and calm rather than crowded. If you need to check current macOS or Swift docs while building it, go ahead and look them up online.