adds shadcn, removes skeleton, implements button after styleguide

src/lib/components/ui/card/card-title.svelte

@@ -0,0 +1,20 @@
+<script lang="ts">
+	import type { HTMLAttributes } from "svelte/elements";
+	import { cn, type WithElementRef } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		...restProps
+	}: WithElementRef<HTMLAttributes<HTMLDivElement>> = $props();
+</script>
+
+<div
+	bind:this={ref}
+	data-slot="card-title"
+	class={cn("text-base leading-snug font-medium group-data-[size=sm]/card:text-sm", className)}
+	{...restProps}
+>
+	{@render children?.()}
+</div>