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/blender.py

@@ -136,11 +136,13 @@ class BlenderTestCase(unittest.TestCase):
         )
         cls.image_selection = importlib.import_module("anyimage.common.selection")
         cls.image_frame = importlib.import_module(
-            "anyimage.operators.frame_tool"
+            "anyimage.operators.frame_tool.operators"
         )
         cls.rectify = importlib.import_module(
-            "anyimage.operators.rectify_tool"
+            "anyimage.operators.rectify_tool.operators"
         )
+        cls.rectify_geometry = importlib.import_module("anyimage.operators.rectify_tool.geometry")
+        cls.rectify_preview = importlib.import_module("anyimage.operators.rectify_tool.preview")
         cls.cutout_geometry = importlib.import_module(
             "anyimage.operators.cutout_tool.geometry"
         )
@@ -194,5 +196,3 @@ class BlenderTestCase(unittest.TestCase):
         )
         if hasattr(self.fake_bpy.types.Scene, "anyimage_settings"):
             del self.fake_bpy.types.Scene.anyimage_settings
-        if hasattr(self.fake_bpy.types.Image, "anyimage_upscale_source"):
-            del self.fake_bpy.types.Image.anyimage_upscale_source