added shadcn and started PROJECT.md for tracking

src/lib/components/ui/dropdown-menu/dropdown-menu-checkbox-item.svelte

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+<script lang="ts">
+	import { DropdownMenu as DropdownMenuPrimitive } from "bits-ui";
+	import MinusIcon from '@lucide/svelte/icons/minus';
+	import CheckIcon from '@lucide/svelte/icons/check';
+	import { cn, type WithoutChildrenOrChild } from "#lib/utils.js";
+	import type { Snippet } from "svelte";
+
+	let {
+		ref = $bindable(null),
+		checked = $bindable(false),
+		indeterminate = $bindable(false),
+		class: className,
+		children: childrenProp,
+		closeOnSelect = false,
+		...restProps
+	}: WithoutChildrenOrChild<DropdownMenuPrimitive.CheckboxItemProps> & {
+		children?: Snippet;
+	} = $props();
+</script>
+
+<DropdownMenuPrimitive.CheckboxItem
+	bind:ref
+	{closeOnSelect}
+	bind:checked
+	bind:indeterminate
+	data-slot="dropdown-menu-checkbox-item"
+	class={cn(
+		"focus:bg-accent focus:text-accent-foreground focus:**:text-accent-foreground gap-2 rounded-sm py-1.5 pr-8 pl-2 text-sm data-inset:pl-8 [&_svg:not([class*='size-'])]:size-4 relative flex cursor-default items-center outline-hidden select-none data-disabled:pointer-events-none data-disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0",
+		className
+	)}
+	{...restProps}
+>
+	{#snippet children({ checked, indeterminate })}
+		<span
+			class="absolute right-2 flex items-center justify-center pointer-events-none"
+			data-slot="dropdown-menu-checkbox-item-indicator"
+		>
+			{#if indeterminate}
+				<MinusIcon  />
+			{:else if checked}
+				<CheckIcon  />
+			{/if}
+		</span>
+		{@render childrenProp?.()}
+	{/snippet}
+</DropdownMenuPrimitive.CheckboxItem>