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/anyimage/operators/test_hdr_background.py

@@ -104,12 +104,12 @@ def test_hdr_request_uses_alpha_output_and_current_still(hdr_texture):
     operation = operators.RunBackgroundRemoval
     snapshot = HdrBackgroundInput.prepare(hdr_texture.image)
     operator = SimpleNamespace(input_path=str(snapshot.path), _hdr_input=snapshot,
-                               _image_target=SimpleNamespace(start_frame=17))
-    context = SimpleNamespace(scene=SimpleNamespace(anyimage_settings=SimpleNamespace(video_frames=12)))
+                               _image_target=SimpleNamespace())
+    context = SimpleNamespace(scene=SimpleNamespace(anyimage_settings=SimpleNamespace()))
     try:
         with patch.object(operators, "require_environment"), patch.object(operators, "require_model"), patch.object(operators, "production_device", return_value="CPU"):
             parameters = operation.request(operator, context)
         assert parameters["output_kind"] == "alpha"
-        assert parameters["start_frame"] == parameters["video_frames"] == 1
+        assert "start_frame" not in parameters and "video_frames" not in parameters
     finally:
         cleanup_image_input(snapshot.path, True)