# Exploration: Alarm Live Countdown & Snooze Dismiss

## Feature 1: Live countdown in pre-notice notification

### Current state
`PluriWaveAlarmReceiver.showPreNoticeNotification()` posts a single notification with hardcoded Spanish text `"Empieza en 30 minutos"`. No l10n, no update mechanism. Notification ID is deterministic (`53 * alarmId.hashCode() + 7`), enabling in-place updates.

### Recommended approach (B)
Compute remaining minutes at fire time: `(triggerAtMillis - System.currentTimeMillis()) / 60_000`. Use existing translated `durationMinutesOnly` key (`"{minutes} min"`) already available in all 13 locales.

### Why not live updates
- AlarmManager chain (30 PendingIntents): quota risk on API 31+
- Foreground service: MIUI/OneUI/ColorOS kill aggressively (~60% of market)
- Flutter Timer.periodic: only works when app is foregrounded

## Feature 2: Snooze dismisses modal reliably

### Current state
`_posponer()` calls `navigator.pop()` but when app is launched from dead state via full-screen intent, Navigator stack is empty and `pop()` is a no-op. Screen stays visible.

### Fix
```dart
if (navigator.canPop()) {
  navigator.pop();
} else {
  SystemNavigator.pop();
}
```

## Affected Files
- `android/.../PluriWaveAlarmReceiver.kt` — compute remaining, l10n-ready text
- `lib/pantallas/pantalla_alarma_sonando.dart` — canPop guard
- `lib/l10n/app_*.arb` — new pre-notice l10n key if needed