Refactor geometry generation to standardize Blender object coordinates

- Unified the canonical local frame for generated geometries (Plane, Depth Plane, Relief Plane, Cutout, Depth Cutout) to align with Blender's object coordinate system, setting X as horizontal, Z as up, and +Y as depth.
- Removed the `Depth Axis` parameter from `O Image Cutout` and `O Image Depth Cutout`, simplifying the geometry generation process.
- Updated the depth direction defaults to use +Y instead of -Z for `O Image Relief Plane` and Depth Symmetry.
- Adjusted the geometry nodes to ensure thickness, projection, and shell displacements operate along the Y-axis.
- Implemented new capabilities for handling object space normals to align with the new canonical frame.
- Enhanced the Depth Symmetry functionality to mirror across the canonical Y-axis and perform a final rotation to maintain the correct orientation.
- Added tests to validate the new coordinate system and ensure compatibility with existing assets.

tests/support/image_objects.py

@@ -115,11 +115,6 @@ def _add_cutout_modifier(obj, shape):
     modifier.node_group = group
     if shape in {"FLAT", "DEPTH_SOLID"}:
         object_data.set_modifier_input(modifier, object_data.modifier_input_identifier(group, "Mode"), 1)
-    object_data.set_modifier_input(
-        modifier,
-        object_data.modifier_input_identifier(group, "Depth Axis"),
-        0,
-    )
     object_data.set_modifier_input(
         modifier,
         object_data.modifier_input_identifier(group, "Cleanup Threshold"),