Devlog 2 — File explorer with folder navigation and image viewer

Added a functional “My Documents” app with a real file explorer. The root shows three folders (Wallpapers, Icons, Projects), and double-clicking navigates into them with a “..” button to go back.
Double-clicking an image opens a draggable mini-window with the image preview, centered on screen , reusing the same drag/z-index logic from the main windows. Double-clicking the WebOS1 project entry opens its GitHub repo in a new tab.
Under the hood, the file system is just a JS object (fileSystem) mapping folder names to arrays of items, which made it easy to add new folders/files without touching the rendering logic.