Add storefront component migration: cards, badges, progress bars, animations, and React wrapper package

Major feature migration from dt-shopify-storefront into the design system:

- Card system: per-card color modes (normal/emphasis/warning/success/other),
  progress bars, full-bleed card body (card-body-flush), image bevel clip-paths,
  and visible structural borders at bevel corners
- Badge system: dt-card-badge with position-aware offsets for cards vs media frames
- Media frames: dt-bevel-media with inner surface fill, image clipping, and
  "MISSING MEDIA" placeholder for empty containers
- Interactive bevel buttons: dt-btn with hover/selected states and pulse animation
- Menu items: dt-menu-item with active states and level indentation
- Animations: scale-in, fade-in, slide-up, pulse, ping, spin keyframes
- Feature legend: CSS grid for product feature icons with state colors
- Scrollbar styling for DT brand
- New @dangerousthings/react package wrapping web CSS components
- New @dangerousthings/tailwind-preset package
- New @dangerousthings/hex-background package
- Desktop showcase rewritten in React with Tailwind CSS
- Mobile showcase updated with new screens (animations, filters, advanced cards)
- Tokens: added mode color tokens, RGB variants, and selected-state tokens

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/react-native/src/components/DTBadgeOverlay.tsx

@@ -0,0 +1,45 @@
+/**
+ * DT Badge Overlay
+ *
+ * Positioning wrapper for badges on cards and media frames.
+ * Places children absolutely at a specified corner with configurable offset.
+ */
+
+import {ReactNode} from 'react';
+import {View, ViewStyle, StyleProp} from 'react-native';
+
+type BadgePosition = 'top-left' | 'top-right' | 'bottom-left' | 'bottom-right';
+
+interface DTBadgeOverlayProps {
+  children: ReactNode;
+  /**
+   * Corner position for the badge
+   * @default 'bottom-right'
+   */
+  position?: BadgePosition;
+  /**
+   * Offset from the corner in pixels
+   * @default 8
+   */
+  offset?: number;
+  /**
+   * Additional styles
+   */
+  style?: StyleProp<ViewStyle>;
+}
+
+export function DTBadgeOverlay({
+  children,
+  position = 'bottom-right',
+  offset = 8,
+  style,
+}: DTBadgeOverlayProps) {
+  const positionStyle: ViewStyle = {
+    position: 'absolute',
+    zIndex: 4,
+    ...(position.includes('top') ? {top: offset} : {bottom: offset}),
+    ...(position.includes('right') ? {right: offset} : {left: offset}),
+  };
+
+  return <View style={[positionStyle, style]}>{children}</View>;
+}