HRV Time Domain Integration

[Mr-Imperium]

• Integrated HRV time domain computation using HrvTimeDomain.compute(), storing complete results per breathing rate, computing HRV after recordings, and persisting winning/session results to DB
• Enhanced Polar streaming to buffer RR intervals, compute HRV on stop.
• Added HrvResultCard with collapsed (7 key metrics) and expandable (26 metrics, grouped) views; displayed in Record screen bottom sheet and Resonance Trainer results.
• Persisted winning HRV from Resonance Trainer and enabled automatic UI rendering after test completion.

[Copilot]

Pull request overview

Integrates time-domain HRV computation and persistence into the app, and adds UI to display summarized and detailed HRV metrics after recordings and resonance testing.

Changes:

• Added time-domain HRV computation (HrvTimeDomain.compute) and result model (HrvTimeDomainResult).
• Buffered RR intervals during Polar HR streaming, computed HRV on stop, and persisted HRV results to SQLite.
• Added HrvResultCard UI and surfaced winning HRV results in the resonance trainer completion screen.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
breath_state/lib/widgets/hrv_result_card.dart	New UI card for essential + expanded HRV metrics display.
breath_state/lib/services/resonance_service/rf_trainer.dart	Saves and displays the winning HRV result after the resonance test completes.
breath_state/lib/services/resonance_service/res_freq.dart	Computes and stores full HRV results per breathing rate (replacing RMSSD-only computation).
breath_state/lib/services/hrv_analysis/hrv_time_domain.dart	New time-domain HRV computation implementation and result container.
breath_state/lib/services/heart_rate/polar_connect.dart	Buffers RR intervals per session; computes + persists HRV at recording stop.
breath_state/lib/services/db_service/database_service.dart	Adds DB schema + migration for HRV table and insert/get helpers.
breath_state/lib/constants/db_constants.dart	Adds HRV_TABLE_NAME constant.

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