Milestone 3

frontend/src/components/ui/FlowNode.tsx

@@ -0,0 +1,37 @@
+import type { ReactNode } from 'react';
+
+import { cn, type Accent } from '@/lib/cn';
+
+interface FlowNodeProps {
+  accent?: Accent;
+  children: ReactNode;
+  className?: string;
+}
+
+const ACCENT_BORDER_TEXT: Record<Accent, string> = {
+  red: 'border-red text-red',
+  orange: 'border-orange text-orange',
+  yellow: 'border-yellow text-yellow',
+  green: 'border-green text-green',
+  cyan: 'border-cyan text-cyan',
+  blue: 'border-blue text-blue',
+  purple: 'border-purple text-purple',
+  pink: 'border-pink text-pink',
+  rose: 'border-rose text-rose',
+  teal: 'border-teal text-teal',
+};
+
+/** Flow node from design.md §5.5 — chained horizontally with arrows in flex rows. */
+export function FlowNode({ accent, children, className }: FlowNodeProps) {
+  return (
+    <span
+      className={cn(
+        'inline-block bg-bg-card rounded-md border px-3 py-2 font-mono text-4xs whitespace-nowrap shrink-0',
+        accent ? ACCENT_BORDER_TEXT[accent] : 'border-border text-text',
+        className,
+      )}
+    >
+      {children}
+    </span>
+  );
+}