add shadcn-svelte, add custom titlebar

src/lib/components/ui/button/button.svelte

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+<script lang="ts" module>
+	import type { WithElementRef } from "bits-ui";
+	import type { HTMLAnchorAttributes, HTMLButtonAttributes } from "svelte/elements";
+	import { type VariantProps, tv } from "tailwind-variants";
+
+	export const buttonVariants = tv({
+		base: "ring-offset-background focus-visible:ring-ring inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0",
+		variants: {
+			variant: {
+				default: "bg-primary text-primary-foreground hover:bg-primary/90",
+				destructive: "bg-destructive text-destructive-foreground hover:bg-destructive/90",
+				outline:
+					"border-input bg-background hover:bg-accent hover:text-accent-foreground border",
+				secondary: "bg-secondary text-secondary-foreground hover:bg-secondary/80",
+				ghost: "hover:bg-accent hover:text-accent-foreground",
+				link: "text-primary underline-offset-4 hover:underline",
+			},
+			size: {
+				default: "h-10 px-4 py-2",
+				sm: "h-9 rounded-md px-3",
+				lg: "h-11 rounded-md px-8",
+				icon: "h-10 w-10",
+			},
+		},
+		defaultVariants: {
+			variant: "default",
+			size: "default",
+		},
+	});
+
+	export type ButtonVariant = VariantProps<typeof buttonVariants>["variant"];
+	export type ButtonSize = VariantProps<typeof buttonVariants>["size"];
+
+	export type ButtonProps = WithElementRef<HTMLButtonAttributes> &
+		WithElementRef<HTMLAnchorAttributes> & {
+			variant?: ButtonVariant;
+			size?: ButtonSize;
+		};
+</script>
+
+<script lang="ts">
+	import { cn } from "$lib/utils.js";
+
+	let {
+		class: className,
+		variant = "default",
+		size = "default",
+		ref = $bindable(null),
+		href = undefined,
+		type = "button",
+		children,
+		...restProps
+	}: ButtonProps = $props();
+</script>
+
+{#if href}
+	<a
+		bind:this={ref}
+		class={cn(buttonVariants({ variant, size, className }))}
+		{href}
+		{...restProps}
+	>
+		{@render children?.()}
+	</a>
+{:else}
+	<button
+		bind:this={ref}
+		class={cn(buttonVariants({ variant, size, className }))}
+		{type}
+		{...restProps}
+	>
+		{@render children?.()}
+	</button>
+{/if}

src/lib/components/ui/button/index.ts

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+import Root, {
+	type ButtonProps,
+	type ButtonSize,
+	type ButtonVariant,
+	buttonVariants,
+} from "./button.svelte";
+
+export {
+	Root,
+	type ButtonProps as Props,
+	//
+	Root as Button,
+	buttonVariants,
+	type ButtonProps,
+	type ButtonSize,
+	type ButtonVariant,
+};