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/DTProgressBar.tsx

@@ -0,0 +1,45 @@
+/**
+ * DTProgressBar — Angular progress bar (horizontal or vertical).
+ *
+ * CSS reference: forms-dt.css .dt-progress, .dt-progress-fill, .dt-progress-label
+ */
+
+import type { CSSProperties } from 'react';
+import { cx } from '../utils/cx';
+
+interface DTProgressBarProps {
+  /** Progress value (0–1) */
+  value: number;
+  /** Text label below/beside the bar */
+  label?: string;
+  /** Layout direction @default 'horizontal' */
+  direction?: 'horizontal' | 'vertical';
+  className?: string;
+  style?: CSSProperties;
+}
+
+export function DTProgressBar({
+  value,
+  label,
+  direction = 'horizontal',
+  className,
+  style,
+}: DTProgressBarProps) {
+  const pct = Math.round(Math.max(0, Math.min(1, value)) * 100);
+
+  return (
+    <div className={className} style={style}>
+      <div className={cx('dt-progress', direction === 'vertical' && 'vertical')}>
+        <div
+          className="dt-progress-fill"
+          style={
+            direction === 'vertical'
+              ? { height: `${pct}%` }
+              : { width: `${pct}%` }
+          }
+        />
+      </div>
+      {label && <span className="dt-progress-label">{label}</span>}
+    </div>
+  );
+}