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_model_geometry.py

@@ -31,7 +31,7 @@ def test_geometry_frame_requires_matching_float32_fields():
 
 
 def test_moge_infer_returns_geometry_frames_with_model_validity():
-    mask = np.asarray(((True, False), (True, True)))
+    mask = np.asarray(((1.0, 0.2), (0.7, 0.0)), dtype=np.float32)
     prediction = {
         "depth": np.ones((2, 2), dtype=np.float32),
         "normal": np.zeros((2, 2, 3), dtype=np.float32),