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/properties.py

@@ -258,6 +258,27 @@ def cutout_generate_normal_property():
     )
 
 
+def cutout_alpha_threshold_property():
+    return bpy.props.FloatProperty(
+        name="Alpha Threshold",
+        description="Minimum Alpha kept in the Cutout contour",
+        default=0.9,
+        min=0.0,
+        max=1.0,
+        soft_min=0.1,
+        soft_max=0.9,
+        subtype="FACTOR",
+    )
+
+
+def cutout_fine_outline_property():
+    return bpy.props.BoolProperty(
+        name="Fine Outline",
+        description="Fit detailed outlines and support thin parts; disable for simpler, faster meshes",
+        default=False,
+    )
+
+
 def cutout_mesh_detail_property():
     return bpy.props.EnumProperty(
         name="Mesh Detail",
@@ -273,7 +294,9 @@ def cutout_mesh_detail_property():
 
 
 class AnyImageSettings(bpy.types.PropertyGroup):
+    cutout_alpha_threshold: cutout_alpha_threshold_property()
     cutout_mesh_detail: cutout_mesh_detail_property()
+    cutout_fine_outline: cutout_fine_outline_property()
     cutout_generate_normal: cutout_generate_normal_property()
     cutout_inward_axis: cutout_inward_axis_property()
     mask_gesture: mask_gesture_property()