Document skip_areas parameter in Preloads docstring

[Copilot]

The skip_areas parameter added in e366b49 was missing documentation in the Preloads class docstring.

Changes

• Added skip_areas parameter documentation explaining it skips Voronoi area calculations and split point computations during Delaunay triangulation, useful for Matérn regularization which doesn't require area-based calculations
• Added missing documentation for use_voronoi_areas and areas_factor parameters

def __init__(
    self,
    ...,
    use_voronoi_areas: bool = True,    # Now documented
    areas_factor: float = 0.5,         # Now documented  
    skip_areas: bool = False,          # Now documented
):

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