added shadcn and started PROJECT.md for tracking

src/lib/components/ui/select/select-group-heading.svelte

@@ -0,0 +1,21 @@
+<script lang="ts">
+	import { Select as SelectPrimitive } from "bits-ui";
+	import { cn } from "#lib/utils.js";
+	import type { ComponentProps } from "svelte";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		...restProps
+	}: ComponentProps<typeof SelectPrimitive.GroupHeading> = $props();
+</script>
+
+<SelectPrimitive.GroupHeading
+	bind:ref
+	data-slot="select-group-heading"
+	class={cn("text-muted-foreground px-2 py-1.5 text-xs", className)}
+	{...restProps}
+>
+	{@render children?.()}
+</SelectPrimitive.GroupHeading>