feat: true geometric wrapper engine (shapely), convex hull 3D preview

fix: full 3D rotation, true dynamic wrapper enclosure, rotation-aware AABB

fix: rotation on STL imports, live enclosure update, cutout gizmo, non-rect preview

feat: TOP/BOTTOM faces, 3MF export, grid snap, component library, non-rectangular shapes, chamfer/bevel

feat: parts panel, per-part styles, style presets, tray and bracket parts

feat: heights, PCB standoffs, lid styles, enclosure styles, custom cutouts, hole detection

feat: file import, transform gizmo, component list, view modes

feat: 3D viewer (Three.js), cleaned frontend, local-first README

feat: FastAPI backend + React frontend scaffold

feat: initial engine - bbox generator, connector profiles, CadQuery core