feat: add cssVariables config

[Ken-HH24]

Hi, I try to implement the cssVariables config for #191 . Here is what I did to implement this feature.

• use ts-morph to transform css variables just like shadcn-ui.
• use ts-morph to transform the import statements.

I'm not sure if this works correctly or not.

I run the command shadcn-svelte init and shadcn-svelte add button. It seems to work.

cssVariables = false

// button/index.ts
const buttonVariants = tv({
	variants: {
		variant: {
			default: "bg-slate-900 text-slate-50 hover:bg-slate-900/90 dark:bg-slate-50 dark:text-slate-900 dark:hover:bg-slate-50/90",
			// ... ...
		},
	},
	// ... ...
});

cssVariables = true

// button/index.ts
const buttonVariants = tv({
	variants: {
		variant: {
			default: "bg-primary text-primary-foreground hover:bg-primary/90",
			// ... ..	
		},
	}
	// ... ...
});

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Name	Status	Preview	Comments	Updated (UTC)
shadcn-svelte	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 23, 2023 2:54pm

[huntabyte]

Hey there, thanks a ton for taking this on! I'm going to keep this PR on pause until we add some tests to the CLI to ensure this doesn't break any existing functionality.

[Ken-HH24]

Sure, maybe I can also help with adding tests to the CLI.