feat: Implement weight cutout boundary smoothing for image depth cutout

- Added a new proposal for boundary smoothing in the weight cutout process, differentiating between Split edges and Outline smoothing requirements.
- Introduced a new capability `cutout-boundary-smoothing` to control smoothing strength and default values.
- Updated specifications to define the behavior of boundary-specific smoothing strength and default settings.
- Created tasks to verify the implementation of boundary behavior and asset updates.
- Developed comprehensive tests for depth symmetry and normal scaling to ensure expected behavior and performance.
- Introduced new attributes for normal mapping to facilitate persistent face attributes sharing between depth symmetry and image materials.
- Built a new node group for O Image Depth Symmetry, integrating the new smoothing capabilities and ensuring compatibility with existing workflows.

tests/anyimage/operators/test_cutout_interaction.py

@@ -133,7 +133,7 @@ def test_cutout_pie_passes_image_lasso_options_to_all_ai_shapes(monkeypatch):
     assert [call[2].shape for call in window_manager.pie.calls] == [
         "FLAT",
         "SOLID",
-        "DEPTH_BALLOON",
+        "DEPTH_SYMMETRY",
         "DEPTH_SOLID",
     ]
     assert all(call[2].generate_normal for call in window_manager.pie.calls)
@@ -155,10 +155,10 @@ def test_cutout_pie_passes_image_lasso_options_to_all_ai_shapes(monkeypatch):
 
 def test_cutout_normal_space_is_derived_from_shape():
     assert cutout_main.normal_mode_for_shape("DEPTH_SOLID", False) == "OBJECT"
-    assert cutout_main.normal_mode_for_shape("DEPTH_BALLOON", False) == "TANGENT"
+    assert cutout_main.normal_mode_for_shape("DEPTH_SYMMETRY", False) == "TANGENT"
     assert cutout_main.normal_mode_for_shape("FLAT", True) == "TANGENT"
     assert cutout_main.normal_mode_for_shape("SOLID", True) == "TANGENT"
-    assert cutout_main.normal_mode_for_shape("DEPTH_BALLOON", True) == "TANGENT"
+    assert cutout_main.normal_mode_for_shape("DEPTH_SYMMETRY", True) == "TANGENT"
     assert cutout_main.normal_mode_for_shape("DEPTH_SOLID", True) == "OBJECT"