v2.5.2 - Timezone & Historical Statistics Fixes

🎉 Oura Ring v2 Integration v2.5.2 - Timezone & Historical Statistics Fixes

This release combines PR #45 and PR #47 into a single patch release focused on correct current-day data and reliable historical statistics backfill - Thank you @issmirnov

🐛 FIXES IN v2.5.2

Sensors now show today's data in the configured Home Assistant timezone

• Timezone-aware date window: Daily fetches now use hass.config.time_zone instead of server-local UTC time
• Exclusive end_date fix: API requests now include today + 1 day so Oura's exclusive end_date behavior does not drop the current day
• User impact: Daily sensors no longer lag by one day on Home Assistant OS and other UTC-hosted installs

Historical statistics charts render correctly

• Metadata alignment: Duration and cumulative sensors now publish sum statistics instead of mean when their entity state_class is total or total_increasing
• Cumulative totals: Imported StatisticData.sum values are now emitted as running totals instead of isolated daily values
• User impact: Home Assistant history and statistics charts can render these backfilled sensors correctly

Historical backfill uses corrected Oura API paths

• Resilience backfill: Fixed sleep_recovery_score, daytime_recovery_score, and stress_resilience_score paths
• Stress backfill: Fixed stress and recovery duration keys and converted them from seconds to minutes during import
• SpO2 backfill: Fixed spo2_average to use the nested spo2_percentage.average field
• Readiness backfill: Added sleep_regularity historical import support
• Cardiovascular Age: Corrected the backfill field to use vascular_age
• Sleep Time backfill: Removed broken sleep_time backfill from the generic importer because it requires a dedicated transform that live data already handles correctly

🧪 TESTING & VALIDATION

• ✅ 53 automated tests passing in the Home Assistant Docker test environment
• ✅ Added timezone-aware date window coverage
• ✅ Added statistics metadata alignment coverage
• ✅ Added cumulative sum coverage for imported statistics