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- Removed outdated logic and ensured all changes are documented and tested for regression.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

@@ -71,13 +71,13 @@ class RemoveImageBackground(bpy.types.Operator):
 
 def apply_background_response(result, source_object_name):
     from ..common.image import (
-        load_color_result_image,
+        load_image_edit_result,
         replace_empty_image,
         require_image_empty,
     )
 
     source_object = require_image_empty(source_object_name)
-    result_image = load_color_result_image(source_object, result.directory)
+    result_image = load_image_edit_result(source_object, result.directory)
     replace_empty_image(source_object, result_image)
     if "FINISHED" not in bpy.ops.ed.undo_push(message="Remove Background"):
         raise RuntimeError("Unable to create the Remove Background Undo step")