CORE body temperature sensor support and session chart updates

CORE sensor data ingestion and session visualization

obseed now supports end-to-end ingestion of core body temperature and CORE heat strain index values from imported FIT files.

CORE sensor integration

• FIT file ingestion: core body temperature and heat strain index values are now ingested from imported FIT files, which can also be processed using a single parser call.
• Session charts and admin views: core sensor data and aggregate distributions are rendered directly in session charts and admin views.
• API v3: core sensor metrics are now accessible via API v3.
• Metric accuracy: corrected core temperature statistics that were previously derived from incorrect underlying values.

Session tracking and notifications

• Missing-data bands: sport session charts now feature missing-data bands so recording gaps are explicitly shown instead of silently interpolated.
• Interval metrics: corrected sport session interval metrics.
• Push notifications: fixed an issue where Apple push notifications were dropped prior to delivery.