Rename and recolor basement structural element

[MattiaBressanelli]

Hi

Describe the bug
When renaming and recoloring structural elements, the basement element can't be edited.

To Reproduce
Create a simple model:

# Define the path
data_path = "your_data_path"

# Create a GeoModel instance with the given project name, extent, and refinement level.
data = gp.create_geomodel(
    project_name='horizontal',
    extent=[0, 1000, 0, 1000, 0, 1000],
    refinement=5,
    importer_helper=gp.data.ImporterHelper(
        path_to_orientations=data_path + "orientations.csv",
        path_to_surface_points=data_path + "surface_points.csv"
    )
)

# Map a geological series to the corresponding surfaces.
# Here, the "Strat_Series" is associated with two formations ('rock2' and 'rock1'),
# which defines the stacking order of horizontal layers.
gp.map_stack_to_surfaces(
    gempy_model=data,
    mapping_object={"Strat_Series": ('rock2', 'rock1')}
)

# Compute the geological model using the provided data and mappings.
gp.compute_model(data)
geo_data = data

Fyi the orientations are:

X,Y,Z,azimuth,dip,polarity,formation
500,500,600,60,0,1,rock2
500,500,400,90,0,1,rock1

and the surface points are:

X,Y,Z,formation
100,200,600,rock2
500,200,600,rock2
900,200,600,rock2
100,800,600,rock2
500,800,600,rock2
900,800,600,rock2
100,200,400,rock1
500,200,400,rock1
900,200,400,rock1
100,800,400,rock1
500,800,400,rock1
900,800,400,rock1

Print the structural elements:
print(geo_data.structural_frame.structural_elements)

returns:

[Element(
	name=rock2,
	color=#9f0052,
	is_active=True
), Element(
	name=rock1,
	color=#015482,
	is_active=True
), Element(
	name=basement,
	color=#ffbe00,
	is_active=True
)]

Rename and recolor with:

geo_data.structural_frame.structural_elements[0].color = "#ff0000"
geo_data.structural_frame.structural_elements[0].name = "Level 2"

geo_data.structural_frame.structural_elements[1].color = "#00ff00"
geo_data.structural_frame.structural_elements[1].name = "Level 1"

geo_data.structural_frame.structural_elements[2].color = "#0000ff"
geo_data.structural_frame.structural_elements[2].name = "Level 0"

Reprint structural elements:

[Element(
	name=Level 2,
	color=#ff0000,
	is_active=True
), Element(
	name=Level 1,
	color=#00ff00,
	is_active=True
), Element(
	name=basement,
	color=#ffbe00,
	is_active=True
)]

The basement element ins't changed, and no error/warning is displayed.

Expected behavior
I would expect the basement element to behave like any other with respect to name and color.

Desktop (please complete the following information):

• OS: Windows 10
• GemPy Version: 2025.2.0
• Python Version: 3.13.9

Thanks