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/anyimage/operators/test_ai_input_failures.py

@@ -40,29 +40,7 @@ class AiInputFailuresTest(BlenderTestCase):
             self.assertEqual(messages[0], messages[1])
             self.assertIn("Unsupported input format: .tiff", messages[0])
 
-    def test_remove_background_catches_nested_error(self):
-        operator = self.remove_background.RemoveImageBackground()
-        operator.report = Mock()
-        ops = SimpleNamespace(anyimage=SimpleNamespace(
-            run_background_removal=Mock(side_effect=RuntimeError("Error: invalid input\n"))))
-        with patch.object(self.remove_background.bpy, "ops", ops, create=True):
-            self.assertEqual(operator.execute(None), {"CANCELLED"})
-        operator.report.assert_called_once_with({"ERROR"}, "invalid input")
-
-    def test_setup_failures_cancel_at_each_boundary(self):
-        for ready in (True, False):
-            operator = self.ai_setup.SetupAIEnvironment()
-            operator.use_mirror = False
-            operator.report = Mock()
-            failing = Mock(side_effect=RuntimeError("Error: setup failed\n"))
-            ops = SimpleNamespace(anyimage=SimpleNamespace(
-                download_required_models=failing, install_environment=failing))
-            with (
-                patch.object(self.ai_setup, "ai_status", return_value={"ready": False, "environment_ready": ready}),
-                patch.object(self.ai_setup.bpy, "ops", ops, create=True),
-            ):
-                self.assertEqual(operator.execute(None), {"CANCELLED"})
-            operator.report.assert_called_once_with({"ERROR"}, "setup failed")
+    def test_invoke_ai_setup_reports_nested_failure(self):
         owner = SimpleNamespace(report=Mock())
         with (
             patch.object(self.ai, "ai_ready", return_value=False),