Add comprehensive tests for image processing and mask functionalities

- Introduced tests for color image handling, ensuring source preservation and premultiplied alpha usage.
- Implemented tests for brush stroke operations, validating segment boundaries and brush anti-aliasing.
- Added tests for frame anti-aliasing, confirming correct rendering behavior with various alpha values and depth settings.
- Created tests for frame projection, ensuring accurate overlap calculations and half-plane clipping.
- Developed tests for image premultiplied retention, verifying behavior during loading and packing processes.
- Added undo functionality tests for mask operations, ensuring single transaction behavior during edits.

src/anyimage/operators/cutout_tool/interaction.py

@@ -29,7 +29,6 @@ def _pie_button(
     icon,
     source_name,
     selection_path_json,
-    refine_selection,
     generate_normal,
     point_spacing,
     inward_axis,
@@ -42,7 +41,6 @@ def _pie_button(
     operator.source_object_name = source_name
     operator.selection_path_json = selection_path_json
     operator.shape = shape
-    operator.refine_selection = refine_selection
     operator.generate_normal = generate_normal
     operator.point_spacing = point_spacing
     operator.inward_axis = inward_axis
@@ -53,14 +51,12 @@ def open_shape_pie(
     event,
     source_object,
     selection_path,
-    refine_selection=False,
 ):
     source_name = source_object.name
     selection_path_json = selection_path.to_json()
     settings = context.scene.anyimage_settings
     point_spacing = cutout_mesh_detail_spacing(settings.cutout_mesh_detail)
     ready = ai_ready()
-    refine_selection = ready and refine_selection
     generate_normal = ready and bool(
         getattr(settings, "cutout_generate_normal", False)
     )
@@ -77,7 +73,6 @@ def open_shape_pie(
                 icon,
                 source_name,
                 selection_path_json,
-                refine_selection,
                 generate_normal,
                 point_spacing,
                 inward_axis,