Enhance image editing tests and functionality

- Added parameterized tests for image edit replacement to ensure alpha mode preservation.
- Refactored existing tests to utilize new image editing methods and improve clarity.
- Introduced new tests for image target functionality, ensuring proper handling of shared textures and context.
- Updated various tests to validate alpha mode handling across different scenarios.
- Improved undo/redo functionality in image operators to maintain state consistency.
- Added support for texture node actions, enhancing integration with Blender's node system.
- Ensured that image properties are preserved during operations and that invalid contexts are handled gracefully.

tests/anyimage/operators/test_upscale_undo.py

@@ -6,6 +6,7 @@ from PIL import Image
 
 from anyimage.operators.upscale import UpscaleImage
 from anyimage.common.image import image_pixels
+from anyimage.common.image_target import ImageEditTarget
 
 
 def test_upscale_result_replacement_undo_restores_source(tmp_path):
@@ -21,8 +22,7 @@ def test_upscale_result_replacement_undo_restores_source(tmp_path):
     Image.new("RGBA", (16,16), (32,64,96,128)).save(tmp_path / "upscale.0001.png")
 
     def execute(operator, context):
-        operator.source_object_name = owner_name
-        operator.source_image_name = source_name
+        operator._image_target = ImageEditTarget.capture(SimpleNamespace(object=owner))
         operator.model = "PISA_SR"
         operator.response(context, SimpleNamespace(directory=tmp_path))
         return {"FINISHED"}