feat(health): Overall Health dashboard + wearable Stats tabs (v0.0.94)

[rwlove]

What

A whole-body Health view fed by the Android Health Connect metrics ingested in v0.0.93, plus per-metric Stats tabs. Hybrid layout: a dedicated Health page for the overview, the four detail views as Stats tabs, with dashboard tiles deep-linking into them.

Health page (/health/) — new top-nav

One-page dashboard pulling from every source PUMP tracks — body weight, strength training, and wearable metrics — as summary tiles (latest value + trend delta + sparkline), each deep-linking to its Stats tab.

New Stats tabs

• Steps — daily bars + 7-day rolling average + today/avg/best tiles
• Heart Rate — resting-HR trend line with a daily min–max band + avg
• Sleep — stacked stages (deep/light/REM/awake) + duration + tiles
• Cardio — session-minutes bars + recent-sessions table

All four lazy-init on shown.bs.tab, respect the global period selector, and are deep-link targets (/stats/#tab-steps).

How

• internal/web/healthstats.go type-asserts the store to store.HealthStore and aggregates raw health_record rows into compact daily/nightly/session series (models.HealthStats). Degrades to empty states when there's no HealthStore (split-frontend mode).
• internal/web/public/js/health-charts.js — Chart.js renderers + dashboard sparklines, matching the existing weight-chart.js / stats.js conventions and the COLOR theme. Look-and-feel is identical to the existing tabs (same panel cards, page-tab-btn tabs, Chart.js 4.4.1).
• New /health/ route in both RegisterRoutes and startRouter; nav entry in header.html.

Notes

• No schema change — reads the v8 health_record table. Pure UI/read. Releases as pump-v0.0.94.
• Existing strength-stats screenshots are unchanged (those tabs weren't touched); added new screenshots for the Health page + the four wearable tabs.
• Verified locally against a seeded Postgres (6 weeks of steps/HR/sleep/cardio + weight + sets): all pages render 200, tiles/charts populate, empty states behave, deep-links activate the right tab.

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