feat: Add new Geometry Nodes groups for image relief and shadeless shader

- Implemented the "O Image Relief Plane" Geometry Nodes group to create a fixed-base image relief using depth images and various parameters.
- Created the "O Shadeless" shader node group to display color without scene lighting while preserving shadows and reflections.
- Introduced a preview feature for node groups, allowing for interactive visualization of node arrangements in an HTML format.
- Added a template HTML file for rendering node previews with customizable views and controls.

tests/test_sync_models.py

@@ -9,7 +9,7 @@ PROJECT_ROOT = Path(__file__).resolve().parents[1]
 
 
 def load_sync_models():
-    path = PROJECT_ROOT / "tools" / "sync_models.py"
+    path = PROJECT_ROOT / "tools" / "models" / "cli.py"
     spec = importlib.util.spec_from_file_location("sync_models", path)
     module = importlib.util.module_from_spec(spec)
     sys.modules[spec.name] = module
@@ -87,7 +87,7 @@ class SyncModelsTests(unittest.TestCase):
         self.assertEqual(command[-2], model.remote)
 
     def test_verify_file_checks_size_and_sha256(self):
-        path = PROJECT_ROOT / "tools" / "sync_models.py"
+        path = PROJECT_ROOT / "tools" / "models" / "cli.py"
         size = path.stat().st_size
         digest = self.sync.file_sha256(path)
         self.assertTrue(self.sync.verify_file(path, size, digest))