An OS alarm an hour before each upcoming event the user RSVP'd going or
interested to. Because the OS holds the alarm it fires with the app fully
closed — the only closed-app notification achievable without a server.
- src/lib/reminders.ts: schedule/cancel via @capacitor/local-notifications,
tracking handed-out ids in localStorage so withdrawn RSVPs and passed events
are cancelled without disturbing one-off notifications. Web is a no-op.
- src/hooks/useLocalReminders.ts: reuses the existing upcoming-events and
my-RSVPs queries; no new relay destination, no signing.
- Bridge mounts the hook only on native and only when the new 'reminders'
pref is on; unmount cancels everything (opt-out/logout).
- Skipped the Pro-expiry reminder on purpose: it would drag the heavy
useSasquatchPro query into a nudge.
Bumps to v1.5.7 (versionCode 10507); APK rebuilt.
