Refactor depth node groups and simplify options

- Removed `Smooth Weight` input from `O Image Depth Plane`, `O Image Depth Cutout`, and `O Image Depth Panorama` to streamline the interface and maintain consistent boundary smoothing behavior.
- Adjusted the `Reference Depth` input to appear last in the options panel for better organization, reflecting its role as a calibration value.
- Consolidated the `expand_smooth()` function to only accept necessary parameters, eliminating unused branches related to `Smooth Weight` and `pin_sharp`.
- Updated related tests and node assets to ensure functionality remains intact and consistent with the new structure.
- Introduced new specifications to document the changes and ensure compliance with the updated requirements.

tests/support/image_objects.py

@@ -3,7 +3,6 @@ import numpy as np
 
 
 from anyimage.common import image as image_data
-from anyimage.common import object as object_data
 from anyimage.common.selection import SelectionMask
 from anyimage.operators.cutout_tool import geometry as cutout_geometry
 from anyimage.operators.cutout_tool import object as cutout_object
@@ -107,18 +106,3 @@ def _evaluated_positions(obj):
         evaluated.to_mesh_clear()
 
 
-def _add_cutout_modifier(obj, shape):
-    group = cutout_object.load_cutout_node_group(shape)
-    modifier = obj.modifiers.new(group.name, "NODES")
-    modifier.node_group = group
-    if shape in {"FLAT", "DEPTH_SOLID"}:
-        object_data.set_modifier_input(modifier, object_data.modifier_input_identifier(group, "Mode"), 1)
-    if shape == "DEPTH_SOLID":
-        object_data.set_modifier_input(
-            modifier,
-            object_data.modifier_input_identifier(group, "Smooth Weight"),
-            0.0,
-        )
-    return modifier
-
-