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.

tests/tools/nodes/test_cutouts.py

@@ -26,7 +26,7 @@ def test_depth_axis_is_visible_in_options(shape, source):
     assert axis.default_value == "-Z"
     assert "Inward Axis" not in inputs
     options = [item.name for item in inputs.values() if item.parent == axis.parent]
-    predecessor = "Smooth Weight" if shape == "SOLID" else "Reference Depth"
+    predecessor = "Cleanup Threshold" if shape == "SOLID" else "Reference Depth"
     assert options[options.index(predecessor) + 1] == "Depth Axis"
     if shape == "SOLID":
         assert not any(item.item_type == "PANEL" and item.name == "Data" for item in group.interface.items_tree)