Add depth surface processing and layout tools

- Implemented `cutout_depth_surface.py` for face separation and connected thickness calculations for depth surface assets.
- Created `cutout_depth_surface_layout.py` to arrange nodes for staggered calculation branches in depth surface processing.
- Authored `geometry_layouts.py` to define layouts for various geometry assets, including image cutouts and depth planes.
- Introduced `node_layout.py` for shared presentation rules, facilitating node arrangement and validation in geometry-node layouts.

tools/node_assets/build_depth_plane.py

@@ -2,6 +2,8 @@
 
 import bpy
 
+from geometry_layouts import layout_geometry
+
 
 DEPTH_PLANE_NODE_GROUP_NAME = "O Image Depth Plane"
 
@@ -206,4 +208,5 @@ def build_depth_plane_group(mesh_plane_group):
         "Build a single-sided depth terrain block with a fixed base."
     )
     group.use_fake_user = True
+    layout_geometry(group)
     return group