feat: add shadcn/ui

frontend/app/components/ui/separator.tsx

@@ -0,0 +1,23 @@
+import { Separator as SeparatorPrimitive } from "@base-ui/react/separator"
+
+import { cn } from "~/lib/utils"
+
+function Separator({
+  className,
+  orientation = "horizontal",
+  ...props
+}: SeparatorPrimitive.Props) {
+  return (
+    <SeparatorPrimitive
+      data-slot="separator"
+      orientation={orientation}
+      className={cn(
+        "shrink-0 bg-border data-horizontal:h-px data-horizontal:w-full data-vertical:w-px data-vertical:self-stretch",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+export { Separator }