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.

tests/test_server_runtime.py

@@ -747,4 +747,6 @@ class ServerRuntimeTest(unittest.TestCase):
             input_path,
             depth_mode="VECTOR",
             normal_mode="OBJECT",
+            correct_edge_depth=True,
+            alpha_threshold=0.9,
         )