feat: add queryActivitySummaries

[imikeyi03]

Summary

Adds a minimal queryActivitySummaries(startDate, endDate) API exposing HKActivitySummaryQuery — the per-day Apple activity-ring rollups (move/exercise/stand values and goals), which were previously unreachable from this library even though ActivitySummaryTypeIdentifier is already supported for authorization.

Closes #215.

API

const summaries = await queryActivitySummaries(startDate, endDate)
// → [{ dateYear, dateMonth, dateDay,
//      activeEnergyBurned, activeEnergyBurnedGoal,        // kcal
//      appleExerciseTime, appleExerciseTimeGoal,          // minutes
//      appleStandHours, appleStandHoursGoal,              // count
//      appleMoveTime, appleMoveTimeGoal }]                // minutes (move-minutes mode; 0 otherwise)

Design notes:

• Dates are returned as calendar components (dateYear/dateMonth/dateDay) rather than a Date, because HKActivitySummary is keyed by DateComponents — converting to a timestamp would impose a timezone assumption on callers. The query inputs are reduced to day granularity in the user's current calendar, which is inherent to HKActivitySummaryQuery.
• The predicate sets .calendar on both DateComponents (the classic HKActivitySummaryQuery gotcha — without it the query silently returns nothing).
• New standalone ActivitySummaryModule mirroring the existing per-domain module structure (StateOfMindModule was the exemplar): nitro spec + nitro.json autolinking registration + Swift impl + bindRetypedMethod bindings + UnavailableFnFromModule fallback on non-iOS platforms.

Testing

• bun codegen, bun typecheck, bun lint, bun run test all green locally.
• Honest caveat: authored on Linux against Apple's documentation and this repo's module patterns — I could not run the example app on a device. I'd appreciate a maintainer validating the query on hardware; happy to iterate on anything (API shape included) in review.

[changeset-bot]

🦋 Changeset detected

Latest commit: 4608b7c

The changes in this PR will be included in the next version bump.

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@kingstinct/react-native-healthkit	Minor

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