Add new functionality for image rectification and depth metadata handling

- Implemented a preview tool for rectifying images with interactive aspect controls in `preview.py`.
- Added tests for depth metadata loading to ensure consistent schema usage in `test_depth_metadata.py`.
- Developed comprehensive tests for cutout calibration processes in `test_cutout_calibration.py`, including stability checks and depth calibration.
- Created tests for frame compositing operations in `test_frame_compositing.py`, ensuring correct handling of depth and transparency.
- Introduced material slot inheritance functionality in `material_slots.py` to manage geometry material assignments.
- Built shared shader nodes for material processing in `shader.py`, including roughness and bump mapping setups.

tests/support/planes.py

@@ -1,38 +1,29 @@
 """Evaluate complete-image projection and rectangular surface topology."""
-from tests.support.paths import PROJECT_ROOT
 
 import bpy
 import numpy as np
 import pytest
 
-ROOT = PROJECT_ROOT
 from tools.nodes.groups.image_plane import build_image_plane_group
 from tools.nodes.groups.image_depth_plane import build_image_depth_plane_group
 from tools.nodes.groups.image_relief_plane import build_image_relief_plane_group
 
 
-@pytest.fixture(params=("definition", "asset"))
-def surface(request):
-    return create_surface(request.param, "DEPTH")
+@pytest.fixture
+def surface():
+    return create_surface("DEPTH")
 
 
-@pytest.fixture(params=("definition", "asset"))
-def relief(request):
-    return create_surface(request.param, "RELIEF")
+@pytest.fixture
+def relief():
+    return create_surface("RELIEF")
 
 
-def create_surface(source, plane_type):
+def create_surface(plane_type):
     bpy.ops.wm.read_factory_settings(use_empty=True)
-    group_name = f"O Image {plane_type.title()} Plane"
-    if source == "asset":
-        with bpy.data.libraries.load(str(ROOT / "src/anyimage/assets/O_AnyImage.blend")) as (library, target):
-            target.node_groups = [group_name]
-        group = target.node_groups[0]
-        plane = group.nodes["Group"].node_tree
-    else:
-        plane = build_image_plane_group()
-        builder = build_image_depth_plane_group if plane_type == "DEPTH" else build_image_relief_plane_group
-        group = builder(plane)
+    plane = build_image_plane_group()
+    builder = build_image_depth_plane_group if plane_type == "DEPTH" else build_image_relief_plane_group
+    group = builder(plane)
     mesh = bpy.data.meshes.new("Rectangle")
     mesh.from_pydata([(-2, -1, 0), (2, -1, 0), (2, 1, 0), (-2, 1, 0)], [], [(0, 1, 2, 3)])
     material = bpy.data.materials.new("Image")
@@ -65,8 +56,8 @@ def create_surface(source, plane_type):
         set_value(name, value)
     if "Boundary Smooth" in inputs:
         set_value("Boundary Smooth", 0)
-    if "Split Threshold" in inputs:
-        set_value("Split Threshold", 0.0)
+    if "Depth Split" in inputs:
+        set_value("Depth Split", 0.0)
     return obj, set_value, plane, inputs, image