Sleep Tracker

Recreate the "Sleep Tracker" screen in React Native using LumioUI.

Goal: Review last night on a sleep chart you can scrub by finger, the screen brightening toward morning as you near wake time. Stage breakdown, a week of bedtimes, vitals and a smart alarm follow. 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/health-sleep-tracker
```

Or pull just the components: `npx @lumioui/cli add animated-number icon progress-ring pro/sparkline switch 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

### `animated-number` — Number that moves to each new value as a calm count-up or a roll where only the changed digits turn, set in type or in dot-matrix LEDs whose dots switch on in place. Screen readers announce just the final value, not every step.
- `<AnimatedNumber>` ×2 — The night's total counts up as the hypnogram draws across.

### `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>` ×4

### `progress-ring` — Circular progress ring with a bright bead on its leading edge. Reaching 100% brightens the ring and briefly turns any centre figure into a check; an indeterminate mode laps the track.
- `<ProgressRing>` ×1

### `sparkline` — Small trend line with an end dot that draws itself in and tints up or down. New data reshapes the line smoothly, and it can follow your finger with a cursor so your app shows the value.
- `<Sparkline>` ×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>` ×28

## 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/health/sleep-tracker.tsx` exporting SleepTrackerScreen. 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/health-sleep-tracker
```

The source lands at `screens/health/sleep-tracker.tsx`.

Screen: https://lumioui.com/screens/health-sleep-tracker