[feat]: Option to disable the classbased dark mode selector

[gshahbazian]

Feature description

Anytime I add a component with shadcn it adds

@custom-variant dark (&:is(.dark *));

to globals.css, even when we only want to support prefers-color-scheme default dark mode. Is there any way to tell the shadcn command not to alter the dark variant?

Affected component/components

No response

Additional Context

Additional details here...

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