Add comprehensive tests for edge depth extension, empty image edits, and material view adaptation

- Introduced `test_edge_depth.py` to validate the functionality of edge depth extension, ensuring core alpha preservation, proper depth handling, and edge padding behavior.
- Created `test_empty_image_edits.py` to verify the behavior of image edits in Blender, focusing on shared edits, preservation of image properties, and handling of failed operations.
- Developed `test_material_view_adaptation.py` to test material adaptation preferences, ensuring color space and alpha settings are correctly applied and preserved across various scenarios.

src/anyimage/server/jobs/cutout.py

@@ -19,6 +19,8 @@ def run(context, parameters):
             input_path,
             depth_mode=depth_mode,
             normal_mode=normal_mode,
+            correct_edge_depth=depth_mode.upper() != "NONE",
+            alpha_threshold=float(parameters.get("alpha_threshold", 0.9)),
         )
         result.update({key: path.name for key, path in artifacts.items()})
     context.check_cancelled()