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KC-5: Consolidate calendar access into CalendarStore.shared so Today, Calendar, Onboarding, and Settings share one permission state and event cache. requestAccess() debounces and reads authoritative status; turning on "Show Calendar Events" while unauthorized now prompts. New Settings → Data → Calendar row shows Connected/Connect/Denied. KC-6: Add calendar-event notifications. CalendarStore.upcomingEventNotifs snapshots visible events (next 7 days); NotificationManager schedules at start time plus each event alarm (all-day at 9am), capped at ~20 to stay under iOS's 64-notification limit. Wired into reschedule(). Log KC-5 and KC-6 in ISSUES.md. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>