feat(ui): port dashboard components to react

src/lib/ui/components/Separator.tsx

@@ -0,0 +1,19 @@
+export interface SeparatorProps {
+  orientation?: "horizontal" | "vertical";
+  dense?: boolean;
+}
+
+export function Separator({
+  orientation = "horizontal",
+  dense = false,
+}: SeparatorProps) {
+  return (
+    <div
+      className="separator"
+      data-orientation={orientation}
+      data-dense={dense}
+      role="separator"
+      aria-orientation={orientation}
+    />
+  );
+}