feat: Implement weight cutout boundary smoothing for image depth cutout

- Added a new proposal for boundary smoothing in the weight cutout process, differentiating between Split edges and Outline smoothing requirements.
- Introduced a new capability `cutout-boundary-smoothing` to control smoothing strength and default values.
- Updated specifications to define the behavior of boundary-specific smoothing strength and default settings.
- Created tasks to verify the implementation of boundary behavior and asset updates.
- Developed comprehensive tests for depth symmetry and normal scaling to ensure expected behavior and performance.
- Introduced new attributes for normal mapping to facilitate persistent face attributes sharing between depth symmetry and image materials.
- Built a new node group for O Image Depth Symmetry, integrating the new smoothing capabilities and ensuring compatibility with existing workflows.

tools/nodes/arrangement/layout.py

@@ -90,7 +90,7 @@ def plan_layout(nodes, edges, size, blocks, core):
                 continue
             sy = items[u]["outputs"][e][1] if a in members else 16.0
             ty = items[v]["inputs"][e][1] if b in members else 16.0
-            weight = 3.0 if edge_types[e] == "GEOMETRY" else 1.0
+            weight = 3.0 if edge_types[e] in {"GEOMETRY", "SHADER"} else 1.0
             links.append((e, u, v, sy, ty, weight))
         parents = {k: set() for k in items}
         children = {k: set() for k in items}
@@ -360,7 +360,7 @@ def plan_layout(nodes, edges, size, blocks, core):
         u, v = node_atom[a], node_atom[b]
         sy = seed[a][1] + size[a].sockets[edges[e].from_socket] - atoms[u]["preferred"]
         ty = seed[b][1] + size[b].sockets[edges[e].to_socket] - atoms[v]["preferred"]
-        weight = 3.0 if edge_types[e] == "GEOMETRY" else 1.0
+        weight = 3.0 if edge_types[e] in {"GEOMETRY", "SHADER"} else 1.0
         if e in edge_bus:
             weight *= 0.15
         sequence = [(u, sy), (v, ty)] if e not in edge_bus else [(u, sy), (edge_bus[e], 12.0), (v, ty)]