AU-023: HR zones chart — today's time in each zone

Track: 1 — MVP
Section: 1.27 Heart Rate Display
Status: [ ] Todo
Repo: app-user
Branch: feature/AU-023-hr-zones-chart

Done When

Horizontal stacked bar chart: Zone 1-5 with minutes. Colors: grey/blue/green/orange/red. Data from health_metrics

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