refactor(ui): extract reusable component package

packages/ui/src/components/ScanlineField.tsx

@@ -0,0 +1,21 @@
+export interface ScanlineFieldProps {
+  intensity?: "soft" | "medium" | "hard";
+  size?: "sm" | "md" | "lg";
+  tone?: "neutral" | "accent" | "warning";
+}
+
+export function ScanlineField({
+  intensity = "medium",
+  size = "md",
+  tone = "neutral",
+}: ScanlineFieldProps) {
+  return (
+    <div
+      className="scanline-field"
+      data-intensity={intensity}
+      data-size={size}
+      data-tone={tone}
+      aria-hidden="true"
+    />
+  );
+}