Appearance

Recreate the "Appearance" screen in React Native using LumioUI.

Goal: Choose light or dark mode, text size and a colour theme with a miniature phone that updates live. Picking Dark lowers night over the preview from the top, and Light lifts it away again. 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/core-appearance
```

Or pull just the components: `npx @lumioui/cli add icon segmented-control slider switch text`

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

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

## Components — how, where, when

### `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>` ×6

### `segmented-control` — Segmented control for switching between a few options, with text segments that can carry icons. The highlight slides smoothly to your pick and can be dragged, and a glass style suits photos.
- `<SegmentedControl>` ×1

### `slider` — Slider with an optional value bubble and tick marks for stepped values. The fill brightens while you drag, and it can give a brief flicker when you push past either end.
- `<Slider>` ×1

### `switch` — On/off switch whose colour fills in from behind the thumb as it turns on. Turning off fades it back quickly, and a disabled switch gives a gentle flicker when tapped.
- `<Switch>` ×1

### `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>` ×14

## 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/core/appearance.tsx` exporting AppearanceScreen. 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/core-appearance
```

The source lands at `screens/core/appearance.tsx`.

Screen: https://lumioui.com/screens/core-appearance