feat(cutout): implement boundary padding for cutout textures

- Introduced a new `Boundary Padding` preference in the Cutout Tool with a default of 2 px and a configurable range of 1-4 px.
- Updated the Cutout client to establish inward mapping from the final Mask, sampling in a fixed direction and processing independent material RGBA and Depth.
- Enhanced the handling of RGBA and Depth during cutout operations, ensuring proper mapping and preservation of source data.
- Added tests to validate the new boundary padding functionality and its integration with existing cutout processes.

feat(geometry): remove overall mesh smoothing from geometry nodes

- Removed the `Smooth` input from several geometry node groups to eliminate unnecessary overall mesh smoothing.
- Retained `Smooth Weight` for depth nodes while removing it from Cutout and Relief Plane nodes.
- Ensured that boundary, normal, and fill smoothing behaviors remain intact and consistent.
- Updated tests and documentation to reflect the changes in node interfaces and behaviors.

feat(normals): scale tangent normals with depth

- Reused the existing `o_normal_reduction` attribute to adjust Tangent Normal strength based on the geometry's `Depth Scale`.
- Ensured that Tangent Normal strength is consistent with the geometry depth, preserving full strength for materials that do not provide the attribute.
- Updated tests to verify the correct behavior of normal strength adjustments in both Tangent and Object Space.

src/anyimage/operators/convert_to_plane/object.py

@@ -9,6 +9,7 @@ from ...common.image import (
 )
 from ...common.depth import (
     depth_uniform_scale,
+    fit_image_depth_direction,
     load_depth_metadata,
     load_depth_result_image,
 )
@@ -80,12 +81,26 @@ def create_depth_plane_object(
         modifier.node_group = node_group
         modifier.show_group_selector = False
         uniform_scale = depth_uniform_scale(source_object, depth_metadata)
-        for name, value in (
+        inputs = [
             ("Subdivide", max(0, min(10, int(subdivisions)))),
             ("Reference Depth", depth_metadata["reference_depth"] * uniform_scale),
             ("Uniform Scale", uniform_scale),
             ("Depth Image", depth_image),
-        ):
+        ]
+        if plane_type == "RELIEF":
+            try:
+                depth_direction = fit_image_depth_direction(
+                    depth_image,
+                    bounds,
+                    uniform_scale,
+                )
+            except ValueError:
+                depth_direction = (0.0, 0.0, 1.0)
+            inputs.append((
+                "Depth Direction",
+                depth_direction,
+            ))
+        for name, value in inputs:
             set_modifier_input(
                 modifier,
                 modifier_input_identifier(node_group, name),