Refactor Cutout and Image Editing Logic

- Renamed "Base Plane Depth" to "Reference Depth" across validate_cutout.py for consistency.
- Introduced a new specification for Cutout mesh sampling to ensure source pixel spacing is preserved and limits are applied correctly.
- Unified naming conventions for image editing results to maintain consistency across Remove Background, Upscale, and Crop operations.
- Updated the handling of Refine Selection to ensure it retains the original bounds and does not apply unnecessary cropping.
- Enhanced material generation logic to connect image color directly to IOR Level, improving the rendering of dark areas.
- Established clear requirements for geometry depth controls and image result materials to ensure consistent behavior across different components.
- Removed outdated logic and ensured all changes are documented and tested for regression.

src/anyimage/operators/convert_to_plane/object.py

@@ -89,7 +89,7 @@ def create_depth_plane_object(
         ("Subdivide", max(0, min(10, int(subdivisions)))),
         ("Thickness", 0.1),
         ("Depth Scale", 1.0),
-        ("Base Plane Depth", depth_metadata["reference_depth"] * uniform_scale),
+        ("Reference Depth", depth_metadata["reference_depth"] * uniform_scale),
         ("Uniform Scale", uniform_scale),
         ("Depth Image", depth_image),
     ):