Replace the old concise Desktop README with a much-expanded Desktop/README-Desktop.md that consolidates and extends Desktop Mode documentation. The new file adds Design Vision, Windows/macOS/KDE influences, Nebula identity, current development status, milestones (prototype → theming → apps → packaging), recommended workflow (symlinks, apply/reload scripts), suggested layout and visual identity, and useful test commands. Deleted the old Desktop/README.md and updated the top-level README.md to point to Desktop/README-Desktop.md. Purpose: provide a clearer, actionable guide for Desktop Mode development and to separate Desktop Mode docs from Bigscreen Mode.
andrew
8bea372b98