AU-032: HRV current value + 7-day trend

Track: 1 — MVP
Section: 1.30 HRV & SpO2 Display
Status: [ ] Todo
Repo: app-user
Branch: feature/AU-032-hrv-display

Done When

Card: "HRV" with RMSSD value, "ms" unit. Mini line chart for 7-day trend. Green/yellow/red based on personal baseline

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