Add tests for clipboard image functionality and mesh plane asset creation

- Implemented a comprehensive test suite for the clipboard image module, covering various functionalities including operator registration, context handling, and image processing.
- Created a new mesh plane asset with customizable parameters and integrated it into the geometry node system.
- Developed a validation script to ensure the correct behavior of the mesh plane asset, including input handling and output verification.

tests/test_pack.py

@@ -60,10 +60,15 @@ class PackTest(unittest.TestCase):
                     )
 
                 self.assertIn("__init__.py", names)
+                self.assertIn("clipboard_image/__init__.py", names)
+                self.assertIn("clipboard_image/actions.py", names)
+                self.assertIn("clipboard_image/clipboard.py", names)
                 self.assertIn("blender_manifest.toml", names)
                 self.assertIn("operators/depth_plane/operator.py", names)
+                self.assertIn("operators/mesh_plane.py", names)
                 self.assertIn("operators/image.py", names)
                 self.assertIn("operators/balloon/operator.py", names)
+                self.assertIn("operators/image_lasso.py", names)
                 self.assertIn("operators/surface.py", names)
                 self.assertIn(
                     "assets/O_AnyImage.blend",
@@ -74,6 +79,7 @@ class PackTest(unittest.TestCase):
                 self.assertIn("server/geometry/grid_mesh.py", names)
                 self.assertIn("server/geometry/surface.py", names)
                 self.assertIn("server/jobs/background.py", names)
+                self.assertIn("server/jobs/image_lasso.py", names)
                 self.assertIn("server/models/ben2.py", names)
                 self.assertIn("server/models/da3.py", names)
                 self.assertIn("server/models/moge2.py", names)