Refactor Cutout Tool to Use World Space Edge Length

- Replaced the Mesh Detail parameter with a new Edge Length property to define cutout sampling in physical units.
- Introduced Minimum Relative Edge Length preference to control effective spacing based on the bounding box of the cutout content.
- Updated tests to validate the new edge length functionality and ensure consistent behavior across different resolutions and canvas sizes.
- Removed deprecated parameters and adjusted related properties to align with the new edge length implementation.
- Enhanced geometry sampling logic to utilize effective world spacing for both standard and fine outline modes.

tests/tools/nodes/test_depth_cutout.py

@@ -25,8 +25,8 @@ def set_test_structure(monkeypatch, value):
     from tools.nodes.groups import image_depth_cutout
     build = image_depth_cutout.build_front_fields
 
-    def fields(group, rim, normal, normal_weight):
-        result = build(group, rim, normal, normal_weight)
+    def fields(group, volume, normal, normal_weight):
+        result = build(group, volume, normal, normal_weight)
         structure = group.nodes.new("ShaderNodeValue")
         structure.outputs[0].default_value = value
         result["structure"] = structure.outputs[0]