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/index.ts

@@ -30,6 +30,7 @@ export type { DTVariant } from './utils/variantColors';
 export { getVariantColor } from './utils/variantColors';
 export { buildBeveledRectPath } from './utils/bevelPaths';
 export { useComponentLayout } from './utils/useComponentLayout';
+export { useScaleIn, usePulse } from './utils/animations';
 
 // Component exports — existing
 export { DTCard, DTCardClipPath } from './components/DTCard';
@@ -50,6 +51,10 @@ export { DTMediaFrame } from './components/DTMediaFrame';
 export { DTAccordion } from './components/DTAccordion';
 export type { DTAccordionSection } from './components/DTAccordion';
 
+// Component exports — positioning & animation containers
+export { DTBadgeOverlay } from './components/DTBadgeOverlay';
+export { DTStaggerContainer } from './components/DTStaggerContainer';
+
 // Component exports — complex interactive
 export { DTModal } from './components/DTModal';
 export { DTDrawer } from './components/DTDrawer';
@@ -57,6 +62,11 @@ export { DTGallery } from './components/DTGallery';
 export type { DTGalleryItem } from './components/DTGallery';
 export { DTSearchInput } from './components/DTSearchInput';
 
+// Component exports — filter & feature
+export { DTFeatureLegend } from './components/DTFeatureLegend';
+export type { DTFeatureItem } from './components/DTFeatureLegend';
+export { DTMobileFilterOverlay } from './components/DTMobileFilterOverlay';
+
 // Component exports — navigation & decorative
 export { DTMenu, DTMenuDropdown } from './components/DTMenu';
 export type { DTMenuItem } from './components/DTMenu';