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_cutout.py

@@ -4,7 +4,7 @@ from mathutils import Matrix
 from anyimage.operators.cutout_tool.shape import CUTOUT_Z_TO_X, NORMAL_SCALE_ATTRIBUTE_NAME
 from ..common.nodes import interface_socket, group_input, math_node, float_input, menu_switch, read_float_attribute, store_float_attribute, prepare_node_group
 from ..common.smoothing import expand_smooth
-from ..common.cutout import _extrude_layers, _island_cleanup, _offset_geometry_z, _profile_field, _remove_zero_thickness, _set_layer_z, _shade_output
+from ..common.cutout import _extrude_layers, _island_cleanup, _offset_geometry_z, _remove_zero_thickness, _set_layer_z, _shade_output
 
 
 NODE_GROUP_NAME = "O Image Cutout"
@@ -129,16 +129,13 @@ def _build_shell(group, geometry, thickness):
 def _build_balloon(group, geometry, thickness):
     nodes = group.nodes
     links = group.links
-    profile, _profile_factor = _profile_field(group, geometry)
+    profile = read_float_attribute(group, 'o_balloon')
     front_scale = math_node(nodes, "MULTIPLY")
     links.new(profile, front_scale.inputs[0])
     links.new(thickness, front_scale.inputs[1])
-    back = math_node(nodes, "MULTIPLY")
-    links.new(profile, back.inputs[0])
-    links.new(thickness, back.inputs[1])
     negative_back = math_node(nodes, "MULTIPLY")
     negative_back.inputs[1].default_value = -1.0
-    links.new(back.outputs[0], negative_back.inputs[0])
+    links.new(front_scale.outputs[0], negative_back.inputs[0])
     extrude = _extrude_layers(group, geometry)
     shaped = _set_layer_z(
         group,