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_panorama.py

@@ -51,7 +51,6 @@ def build_image_depth_panorama_group():
     boundary_smooth = interface_socket(group, "Boundary Smooth", "INPUT", "NodeSocketInt", options)
     boundary_smooth.default_value, boundary_smooth.min_value, boundary_smooth.max_value = 2, 0, 16
     boundary_smooth.description = "Smooth depth and geometry near cut edges on the panorama surface. Zero disables boundary smoothing."
-    float_input(group, "Smooth Weight", 1, maximum=1, subtype="FACTOR", parent=options).description = "Control the strength of boundary smoothing. Higher values move boundary vertices more."
     float_input(group, "Mask Threshold", 0.9, maximum=1, subtype="FACTOR", parent=options).description = "Set the minimum depth mask value treated as valid. Higher values exclude more partially valid boundary areas."
     float_input(group, "Invalid Distance", 100, minimum=1e-5, subtype="DISTANCE", parent=options).description = "Set the fallback distance from the panorama center for invalid depth areas kept when Depth Mask is disabled."
     data = group.interface.new_panel("Data", default_closed=True)