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.

src/anyimage/common/material.py

@@ -91,9 +91,9 @@ def material_node_group(depth_plane=False):
 
 
 def create_image_material(
-    source_object,
+    source_image,
     color_image,
-    depth_scale,
+    depth_scale=0.0,
     displacement_image=None,
     displacement_midlevel=0.0,
     displacement_scale=1.0,
@@ -107,11 +107,10 @@ def create_image_material(
     use_cyclic=None,
     normal_image=None,
     normal_space="TANGENT",
-    ior=None,
     scene=None,
 ):
     material_image = configure_material_color_image(color_image, scene)
-    material = bpy.data.materials.new(image_base_name(source_object.data))
+    material = bpy.data.materials.new(image_base_name(source_image))
     material.use_nodes = True
     if hasattr(material, "surface_render_method"):
         material.surface_render_method = "DITHERED"
@@ -155,6 +154,10 @@ def create_image_material(
     material_inputs.node_tree = material_node_group(is_depth_plane)
     material_inputs.location = (-300.0, 350.0)
     material_inputs.inputs["Bump Scale"].default_value = depth_scale
+    if not is_depth_plane:
+        material_inputs.inputs["Alpha Fix"].default_value = float(
+            configured_material_view_adaptation()
+        )
     if "Object Space" in material_inputs.inputs:
         if normal_space not in {"TANGENT", "OBJECT"}:
             raise ValueError(f"Unsupported normal space: {normal_space}")
@@ -201,8 +204,7 @@ def create_image_material(
     else:
         shader = nodes.new("ShaderNodeBsdfPrincipled")
         shader.location = (250.0, 400.0)
-        if ior is not None:
-            shader.inputs["IOR"].default_value = float(ior)
+        shader.inputs["IOR"].default_value = 1.2
 
         links.new(
             material_inputs.outputs["Color"],