fix: Add missing Separator component

frontend/components/ui/separator.tsx

@@ -0,0 +1,28 @@
+"use client"
+
+import * as React from "react"
+import { cn } from "@/lib/utils"
+
+interface SeparatorProps extends React.HTMLAttributes<HTMLDivElement> {
+    orientation?: "horizontal" | "vertical"
+    decorative?: boolean
+}
+
+const Separator = React.forwardRef<HTMLDivElement, SeparatorProps>(
+    ({ className, orientation = "horizontal", decorative = true, ...props }, ref) => (
+        <div
+            ref={ref}
+            role={decorative ? "none" : "separator"}
+            aria-orientation={decorative ? undefined : orientation}
+            className={cn(
+                "shrink-0 bg-border",
+                orientation === "horizontal" ? "h-[1px] w-full" : "h-full w-[1px]",
+                className
+            )}
+            {...props}
+        />
+    )
+)
+Separator.displayName = "Separator"
+
+export { Separator }