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/tools/nodes/test_boundary_depth.py

@@ -121,13 +121,13 @@ def test_plane_validity_hole_blurs_depth_and_protects_rectangle():
     after, result_faces, result_uv, *_ = plane_mesh(obj)
     assert faces == result_faces
     np.testing.assert_array_equal(result_uv, uv)
-    assert after[:, 2].min() > before[:, 2].min() + .1
+    assert after[:, 1].max() < before[:, 1].max() - .1
     protected = np.any(np.isclose(uv, 0) | np.isclose(uv, 1), axis=1)
     corners = np.concatenate(faces)
     outer = np.unique(corners[protected])
     np.testing.assert_array_equal(after[outer], before[outer])
-    np.testing.assert_allclose(after[:, :2] / (1.2 - after[:, 2:3]),
-                               before[:, :2] / (1.2 - before[:, 2:3]), atol=1e-6)
+    np.testing.assert_allclose(after[:, [0, 2]] / (1.2 + after[:, 1:2]),
+                               before[:, [0, 2]] / (1.2 + before[:, 1:2]), atol=1e-6)
     set_value("Depth Mask", False)
     intact = plane_mesh(obj)[0]
     set_value("Boundary Smooth", 0)