Add overlap-aware event time window (EventFilter.activeWindow)

[chrisballinger]

Summary

The shared occurrence query eventOccurrenceRequest(filter:) bounded the time window by the occurrence's start only, so a query for events in [from, to) dropped events that began before from but are still running — the classic interval bug. This surfaced in the AI "Right Now" flow: the region query's start-bounded SQL prefilter dropped in-progress events before the workflow's client-side overlap gate ever saw them.

This fixes it additively rather than flipping the global semantics. A global flip would change two release features ("today's favorites on map" and "today only" favorites), where multi-day occurrences would start appearing on every day they span — inconsistent with how the day-tab buckets by start day.

Changes

• EventFilter — new activeWindow: DateInterval?, added as the last init parameter to avoid a positional/labeled-arg ordering break. Independent of startDate/endDate, which keep their start-bounded calendar-day meaning. DateInterval is Codable+Hashable, so synthesized conformances still hold.
• PlayaDBImpl.eventOccurrenceRequest(filter:) — when activeWindow is set, apply the overlap predicate (startTime < window.end && endTime > window.start), the same form as fetchEvents(from:to:).
• RightNowWorkflow.regionQuery — use activeWindow instead of startDate/endDate, with a guard floor < windowEnd so an empty/past window can't form an inverted DateInterval. The region query now surfaces events already underway at floor. The client-side overlap gate stays (it unifies the separately-fetched camp/art-hosted occurrences).

This is the documented Phase A2 prerequisite for unifying Nearby / Right Now, and independently fixes a real bug in the AI "Right Now" flow.

Test

testEventOccurrenceRequestActiveWindowKeepsInProgressEvents documents both behaviors so the distinction can't silently regress: start-bounded filtering returns ["in-window"], while activeWindow returns ["ongoing", "in-window"] (keeping the in-progress event, excluding ended/future ones).

Verification

• PlayaDB FilterRequestBuilderTests: 15/15 pass
• iBurn build (iPhone 17 Pro Max, iOS 26.2): 0 errors, 6 pre-existing warnings (unrelated files)

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