The cmap parameter in grdview was still using the legacy @use_alias(C="cmap") decorator while the function had already partially adopted the new AliasSystem approach.

Changes

• Remove C="cmap" from the @use_alias decorator
• Add cmap: str | None = None as an explicit parameter in the function signature
• Add C=Alias(cmap, name="cmap") to the AliasSystem call in the function body
• Add - C = cmap entry to the $aliases docstring section (required for AliasSystem-managed params, unlike @use_alias-managed ones)

# Before
@use_alias(C="cmap", I="shading", f="coltypes", n="interpolation")
def grdview(self, grid, drape_grid=None, ...):
    aliasdict = AliasSystem(
        Jz=Alias(zscale, name="zscale"),
        ...
    )

# After
@use_alias(I="shading", f="coltypes", n="interpolation")
def grdview(self, grid, cmap=None, drape_grid=None, ...):
    aliasdict = AliasSystem(
        C=Alias(cmap, name="cmap"),
        Jz=Alias(zscale, name="zscale"),
        ...
    )

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