CTS Building Builder Pro v1.0.16

SELECTED-PORTION GROOVE REPAIR
- Repairs fully enclosed short groove ribbons when SketchUp creates their four boundary edges but does not generate the enclosed face automatically.
- Uses SketchUp Edge#find_faces only for ribbons lying strictly inside the original wall material.
- Does not run the repair on contours touching the outer wall perimeter or a door/window opening boundary.
- Keeps both V1.0.15 Groove Extent choices and the V1.0.14 native Push/Pull recess engine.

All other Building Builder Pro tools and properties are retained.
