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/README.md

@@ -1,6 +1,6 @@
 # @dangerousthings/react-native
 
-React Native components for the Dangerous Things design system — 18 themed components built on React Native Paper with cyberpunk beveled aesthetics.
+React Native components for the Dangerous Things design system — 22 themed components built on React Native Paper with cyberpunk beveled aesthetics.
 
 ## Install
 
@@ -74,6 +74,9 @@ Options:
 | `DTMediaFrame` | Diagonal beveled frame for images |
 | `DTAccordion` | Collapsible sections with accent border |
 | `DTHexagon` | Decorative hexagon SVG shape |
+| `DTBadgeOverlay` | Absolute-positioned badge wrapper (top-left, top-right, bottom-left, bottom-right) |
+| `DTStaggerContainer` | Staggered scale-in entrance animation for child elements |
+| `DTFeatureLegend` | Product feature grid with icons and rotated labels |
 
 ### Interactive
 
@@ -83,6 +86,14 @@ Options:
 | `DTDrawer` | Side drawer with edge bevels |
 | `DTGallery` | Image gallery |
 | `DTMenu` | Dropdown menu with item variants |
+| `DTMobileFilterOverlay` | Full-screen slide-up filter overlay with backdrop |
+
+### Animation Hooks
+
+| Hook | Description |
+|------|-------------|
+| `useScaleIn` | Scale 0→1 entrance animation |
+| `usePulse` | Looping opacity pulse animation |
 
 ## Usage Examples
 
@@ -99,6 +110,11 @@ import { DTButton, DTCard, DTTextInput } from "@dangerousthings/react-native";
   <Text>Chip detected</Text>
 </DTCard>
 
+// Card with selected state and progress bar
+<DTCard title="PRODUCT" mode="emphasis" selected progress={0.6}>
+  <Text>Selected with 60% progress</Text>
+</DTCard>
+
 // Text input with error state
 <DTTextInput
   variant="normal"