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- Removed outdated logic and ensured all changes are documented and tested for regression.

tools/node_assets/validate.py

@@ -70,7 +70,7 @@ def main():
         "Subdivide",
         "Thickness",
         "Depth Scale",
-        "Base Plane Depth",
+        "Reference Depth",
         "Uniform Scale",
         "Depth Image",
     ]
@@ -79,7 +79,7 @@ def main():
     ]
     assert [panel.name for panel in depth_panels] == ["Options", "Data"]
     assert [item.name for item in depth_panels[0].interface_items] == [
-        "Base Plane Depth"
+        "Reference Depth"
     ]
     assert [item.name for item in depth_panels[1].interface_items] == [
         "Uniform Scale",