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/src/components/DTLabel.tsx

@@ -0,0 +1,33 @@
+/**
+ * DTLabel — Filled badge/label with top-right bevel and mode color.
+ *
+ * CSS reference: bevels.css .badge, .badge-mode, .mode-*
+ */
+
+import type { ReactNode, CSSProperties } from 'react';
+import type { DTVariant } from '@dangerousthings/tokens';
+import { cx } from '../utils/cx';
+import { getVariantClass } from '../utils/variantClasses';
+
+interface DTLabelProps {
+  children: ReactNode;
+  /** Color variant @default 'normal' */
+  variant?: DTVariant;
+  className?: string;
+  style?: CSSProperties;
+}
+
+export function DTLabel({
+  children,
+  variant = 'normal',
+  className,
+  style,
+}: DTLabelProps) {
+  return (
+    <span
+      className={cx('badge', 'badge-mode', getVariantClass(variant), className)}
+      style={style}>
+      {children}
+    </span>
+  );
+}