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.

tools/nodes/groups/image_depth_balloon.py

@@ -68,12 +68,9 @@ def _build_depth_balloon(
     base_front = math_node(nodes, "MULTIPLY")
     links.new(profile, base_front.inputs[0])
     links.new(thickness, base_front.inputs[1])
-    base_back = math_node(nodes, "MULTIPLY")
-    links.new(profile, base_back.inputs[0])
-    links.new(thickness, base_back.inputs[1])
     negate_back = math_node(nodes, "MULTIPLY")
     negate_back.inputs[1].default_value = -1.0
-    links.new(base_back.outputs[0], negate_back.inputs[0])
+    links.new(base_front.outputs[0], negate_back.inputs[0])
     front_mix = nodes.new("ShaderNodeMix")
     front_mix.data_type = "FLOAT"
     front_mix.clamp_factor = True