Continued building the window management system for Kobayashi OS.

Implemented draggable application windows from scratch using React mouse events (mousedown, mousemove, mouseup) with proper drag offsets for smooth movement. Refactored the layout to introduce a dedicated desktop area, keeping windows constrained within the workspace instead of the entire page.

Spent most of the session debugging positioning logic, DOM measurements, and boundary constraints. The draggable window system is now functional and forms the foundation for upcoming features like minimize, maximize, focus (z-index), and Zustand-powered window state management.