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.

tools/nodes/groups/image_depth_cutout.py

@@ -361,8 +361,6 @@ def build_image_depth_cutout_group():
     float_input(group, 'Depth Scale', 1.0, maximum=2.0)
     float_input(group, 'Depth Split', 0.1, maximum=1, subtype='FACTOR').description = 'Split the mesh where depth changes abruptly. Higher values detect smaller depth jumps. Zero disables splitting.'
     options = group.interface.new_panel(name='Options', default_closed=True)
-    float_input(group, 'Smooth Weight', 1.0, maximum=1, subtype='FACTOR', parent=options).description = 'Control the strength of boundary smoothing. Higher values move boundary vertices more.'
-    float_input(group, 'Reference Depth', 1.0, subtype='DISTANCE', parent=options)
     boundary_smooth = interface_socket(group, 'Boundary Smooth', 'INPUT', 'NodeSocketInt', options)
     boundary_smooth.default_value, boundary_smooth.min_value, boundary_smooth.max_value = 4, 0, 16
     boundary_smooth.description = 'Smooth geometry near the original outline and Depth Split edges. Zero disables boundary smoothing.'
@@ -370,6 +368,7 @@ def build_image_depth_cutout_group():
     normal_smooth.default_value, normal_smooth.min_value, normal_smooth.max_value = 64, 16, 512
     normal_smooth.description = 'Control smoothing of front and rear displacement normals. Higher values produce smoother directions.'
     float_input(group, 'Front Inflation', 0.2, maximum=1, subtype='FACTOR', parent=options).description = 'Control how much the front surface bulges in Balloon mode. Zero keeps the original front surface.'
+    float_input(group, 'Reference Depth', 1.0, subtype='DISTANCE', parent=options)
     data = group.interface.new_panel(name='Data', default_closed=True)
     float_input(group, 'Uniform Scale', 1.0, parent=data).hide_in_modifier = True
     interface_socket(group, 'Depth Image', 'INPUT', 'NodeSocketImage', data).hide_in_modifier = True