feat(frontend): add shadcn ui primitives and compatibility bridge

vite-frontend/src/components/ui/separator.tsx

@@ -0,0 +1,27 @@
+import * as React from "react";
+import * as SeparatorPrimitive from "@radix-ui/react-separator";
+
+import { cn } from "@/lib/utils";
+
+function Separator({
+  className,
+  decorative = true,
+  orientation = "horizontal",
+  ...props
+}: React.ComponentProps<typeof SeparatorPrimitive.Root>) {
+  return (
+    <SeparatorPrimitive.Root
+      className={cn(
+        "shrink-0 bg-divider",
+        orientation === "horizontal" ? "h-px w-full" : "h-full w-px",
+        className,
+      )}
+      data-slot="separator"
+      decorative={decorative}
+      orientation={orientation}
+      {...props}
+    />
+  );
+}
+
+export { Separator };