Checkout — Steps

Recreate the "Checkout — Steps" screen in React Native using LumioUI.

Goal: Check out in three steps (address, payment, review) while your items stay on stage and pack tighter with each step. Paying ends on a success seal with your order number. Match the reference implementation's layout, behavior, and motion exactly — this is a production screen, not a mockup.

## Setup

Fastest path — install the screen plus its component deps:

```bash
npx @lumioui/cli add pro/ecommerce-checkout-steps
```

Or pull just the components: `npx @lumioui/cli add action-swap button pro/countdown icon pro/location-card pro/payment-card separator success-seal text`

Native packages:
- react-native-reanimated@*
- react-native-safe-area-context@*
- react-native-svg@*

Stack assumptions: Expo SDK 54 / RN 0.81, Reanimated 4, NativeWind v4, TypeScript strict, Expo Go compatible.

## Components — how, where, when

### `action-swap` — Building blocks for swapping a label or icon in place: the old one fades as the new one appears, plainly, with a small lift or letter by letter. Includes button, text, icon and multi-state versions.
- `<ActionSwapText>` ×1

### `button` — Pill button that presses down under your finger, in eight styles from solid to glass, with a built-in loading state that swaps in place while an action runs.
- `<Button>` ×1

### `countdown` — Live countdown with rolling digits, inline or as blocks that brighten through the final ten seconds. At zero it can celebrate and show your result, or quietly fade if time ran out.
- `<Countdown>` ×1

### `icon` — Icon set drawn on one consistent grid, sized and coloured from your theme. The heart, star and bookmark can fill in place inside their outline, then fade back out.
- `<Icon>` ×7

### `location-card` — Place card with an illustrated street map, route, ETA and pin, with no maps SDK needed. Switching travel mode redraws the route, and arriving glides your dot to the pin.
- `<StaticMap>` ×1

### `payment-card` — Physical or virtual bank card that flips over and tilts under your finger. A long press can reveal the full number and CVV, freezing drains it to grey, and unfreezing brings the colour back.
- `<PaymentCard>` ×1

### `separator` — Thin divider line, horizontal or vertical. It can draw itself in as a page builds, or show a perforated tear line for tickets and receipts.
- `<Separator>` ×1

### `success-seal` — Success moment that stamps a seal onto the receipt, ticket or card that was just paid. Also works as a standalone hero above a title, and shows a clear cross on a decline.
- `<SuccessSeal>` ×1 — Paying stamps the total itself; it catches the light and holds.

### `text` — Themed type scale from caption to display that follows light and dark mode. Includes a pull-quote style with an accent rule and a quieter dimmed tone for secondary text.
- `<Text>` ×25

## Conventions (non-negotiable)

- Styling via NativeWind `className` with semantic tokens only: `bg-background`, `text-foreground`, `bg-card`, `text-card-foreground`, `bg-secondary`, `bg-muted`, `text-muted-foreground`, `bg-accent`, `bg-destructive`, `border-border`. Hard-coded colors only inside media overlays (`text-white`, `bg-black/N`).
- Motion via the token presets from `@lumioui/core` (`spring.press`, `spring.surface`, `spring.glide`, `timing.fast`, `timing.slow`, …) — no bespoke spring configs or durations.
- Gate transform motion behind `useReducedMotion()`; keep opacity/color feedback, drop travel and overshoot.
- Haptics via `useHaptic()`: `light` on press, `selection` on toggle/select, `warning` on invalid input. Never import expo-haptics directly.
- Press feedback via `usePressAnimation()` (~0.97 scale), not `activeOpacity` tricks.
- a11y: `accessibilityRole` + `accessibilityLabel` on every control, touch targets ≥44pt.
- Entrance choreography: staggered `Mount` wrappers (delay 0/60/120…) so regions land in sequence instead of popping in at once.
- Wrap the screen in `SafeAreaView`; keep dark mode working via the semantic tokens.

## Deliverable

One file: `screens/ecommerce/checkout-steps.tsx` exporting CheckoutStepsScreen. Preserve the props interface — the host app wires the callbacks (navigation, submit handlers) through them.

## Reference implementation

This is a LumioUI Pro item: its source is not published in the docs. Install it with a Pro license key
(set `LUMIO_LICENSE_KEY`; keys are on lumioui.com/account) and read the installed file as the reference:

```bash
npx @lumioui/cli add pro/ecommerce-checkout-steps
```

The source lands at `screens/ecommerce/checkout-steps.tsx`.

Screen: https://lumioui.com/screens/ecommerce-checkout-steps