WEB-005: Today's ring metrics — HR, HRV, SpO2, sleep, steps, temp

Track: 1 — MVP
Section: 1.52 Smart Ring Page
Status: [ ] Todo
Repo: champion-stats-hub
Branch: feature/WEB-005-ring-today-metrics

Done When

6 metric cards showing today's values from health_metrics where device_type = ring. Loading skeletons while fetching

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