Add a customization menu (far-right handle) that lists every status-bar
pill with a check mark; toggling a row shows or hides that pill, and the
choice persists across sessions in the config dir.
New pills:
- Coordinates: live cursor readout (re-adds the model-space world offset
so it shows true drawing coordinates), updated on every move rather
than only while a command is active.
- Clean Screen: hide the ribbon and side panels for a full canvas.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
