add shadcn-svelte, add custom titlebar

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

@@ -0,0 +1,17 @@
+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,
+};