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_cutout.py

@@ -276,10 +276,9 @@ def _build_depth_surface(group, geometry, controls):
     )
     geometry = remove_boundary_triangles(group, geometry)
     boundary = edge_boundary_field(group.nodes, group.links)
-    outline = evaluate_field(group, boundary, "BOOLEAN", "POINT")
     rim = evaluate_field(group, boundary, "FLOAT", "POINT")
     camera = build_surface_camera(
-        group, _position_field(group, image), corner_camera, cut_vertex, split, always_vertex=outline,
+        group, _position_field(group, image), corner_camera, cut_vertex, split,
     )
     projection = project_depth_surface(
         group, geometry, camera, scale, controls.outputs["Reference Depth"], controls.outputs["Depth Scale"],