Refactor depth surface handling and unify depth sampling rules

- Removed the `always_vertex` parameter from `build_surface_camera` to streamline depth sampling for cutouts and ensure consistent behavior across depth plane and panorama.
- Updated depth sampling logic to ensure that all free boundary points, including the original frame of the depth plane, use neighboring face depth instead of their own texture sampling.
- Adjusted the depth mask deletion process to operate on faces rather than points, eliminating the need for additional cleanup of dangling edges.
- Ensured that the cutout rules are consistently applied across all relevant nodes, removing exceptions and simplifying the logic.
- Updated tests to verify the new behavior, ensuring that cutout points follow the depth of adjacent faces and that the original frame maintains its depth sampling.
- Refactored geometry handling in multiple depth-related nodes to improve clarity and maintainability.

tools/nodes/groups/image_depth_panorama.py

@@ -4,7 +4,7 @@ import math
 
 import bpy
 
-from ..common.validity import delete_invalid_points
+from ..common.validity import delete_invalid_faces
 
 from ..common.depth_surface import (
     _math, split_depth_surface, build_surface_camera,
@@ -138,7 +138,7 @@ def build_image_depth_panorama_group():
     mixed = _math(group, "MULTIPLY", any_invalid,
                   _math(group, "LESS_THAN", face_invalid, 1))
     protected = uv_map.outputs["Geometry"]
-    culled = delete_invalid_points(group, protected, any_invalid)
+    culled = delete_invalid_faces(group, protected, any_invalid)
     delete = nodes.new("GeometryNodeDeleteGeometry")
     delete.domain, delete.mode = "FACE", "ALL"
     links.new(protected, delete.inputs["Geometry"])