fix(health,stats,wall): decode HC sleep stages, surface HR + active calories, period-aware heatmap, muscle-balance toggle, un-pin wall shell

[rwlove]

Summary

Addresses four reported issues, root-caused against the live store (which currently ingests only steps, heart_rate, sleep, active_calories — no resting_heart_rate, no exercise).

1. Health — deep sleep, heart rate, cardio

• Deep sleep (bug): Health Connect serialises sleep stages as numeric Stage codes ("4"=LIGHT, "5"=DEEP, "6"=REM, 1/3/7=awake). addSleepStages only matched string labels, so Deep/Light/REM stayed 0. Now decodes both numeric codes and labels.
• Heart rate: no resting_heart_rate is ingested, so the Resting HR tile/line were always blank. Synthesize a resting proxy from each day's minimum heart_rate when no real resting record exists; a real record still wins.
• Cardio / active calories: no exercise-session records exist (only daily active_calories). Surfaced active_calories through parser → aggregation as a new ActiveCalories series, with a dashboard tile and a daily chart on the Cardio tab. True per-session cardio still needs the HC bridge to export ExerciseSession records (see Follow-up).

2. Muscle Balance — Sets/Volume toggle

New toggle on the tab, defaulting to Sets (number of sets). Radar chart, breakdown panel, titles, and tooltips all follow the selection.

3. Consistency heatmap — period-aware

Was hard-pinned to a fixed 53-week year. Now scales to the selected period (week/month/year/all time); leading days before the period start render muted.

4. AI page header (wall)

The standard navbar has shipped since v0.0.88, but wall-sw.js served the /wall/ HTML shell cache-first and never bumped CACHE_NAME, so a long-lived kiosk kept painting the pre-navbar shell forever. Now serves the shell network-first (cache fallback for offline boot) and bumps to pump-wall-v4 to evict the stale cache.

Tests

internal/web/healthstats_test.go covers numeric stage decode, the resting-HR proxy (incl. real-record precedence), and active-calorie summing. go test ./... green.

Schema

No schema change — ActiveCalories is aggregation-only over existing health_record rows. No migration / no schema version bump.

Follow-up (bridge, out of this repo)

Per-session cardio needs the Android Health Connect → Webhook bridge to export ExerciseSession records under an exercise key. Until then the Cardio tab shows active calories + an explanatory empty state.

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