* fix: update site labels after camera swaps
* fix: gate scene display until viewer is ready
* fix: render scene loader on first paint
* fix: keep loader during pending scene graph
* feat: add wasd camera panning
* feat: add x delete mode shortcut
* feat: add floorplan north compass
* fix: move floorplan compass to lower corner
* fix: progressively rebuild heavy scene geometry
* fix: simplify noisy ifc wall output
