v1.1.12 — Interactive navigation cube
Closes #60: NavigationCubeView — a Shapr3D/Fusion-style cube tracking the camera with clickable faces/edges/corners that snap to plan/elevation/iso views (goToRegion). Pure unit-tested NavigationCube hit-test (ray→cube→3x3-per-face → 26 regions); robust iOS+macOS. NavigationCubeTests; 136 tests; rendering verified on Vision Pro sim.