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Brand-new accounts (no manual logs, no Apple Health upload yet) used to
land on chart skeletons over blank target bands when they clicked any
metric tab. Apple Health hides those surfaces entirely until the first
observation lands — match the pattern.
Introduce `src/lib/insights/metric-availability.ts` as the single
decision point. `hasMetricData(metric, inputs)` reads `summaries[METRIC].count`
for sensor metrics (PULSE / WEIGHT / BMI / BLOOD_PRESSURE_* / SLEEP_DURATION
/ VO2_MAX / STEPS / ACTIVE_ENERGY), the `hasMood` / `hasMedication`
booleans for event-driven metrics, and BMI inherits from WEIGHT.
Wire three render gates:
- `<InsightsTabStrip>` filters its pills via the new `availability`
prop. Backward compatible: undefined `availability` keeps every pill.
- `<InsightsLayoutShell>` fetches `/api/analytics` +
`/api/insights/comprehensive` once per route and threads the inputs
into the strip; both queries share their cache keys with sub-page
consumers so the payload lands single-fetch.
- Each `src/app/insights/{slug}/page.tsx` early-returns an
`<EmptyState>` with the right CTA — `/measurements/new` for sensor
metrics, `/mood` for Mood, `/medications` for Medication,
`/settings/data-sources` for Sleep.
Auto-light-up: once the iOS native client uploads its first measurement
the same gate flips on the next refetch — no per-metric feature flag.
References the new `insights.emptyState.<metric>.{title,description,cta}`
translation keys (B6 lands them in messages/*.json):
- insights.emptyState.bloodPressure.{title,description,cta}
- insights.emptyState.weight.{title,description,cta}
- insights.emptyState.pulse.{title,description,cta}
- insights.emptyState.mood.{title,description,cta}
- insights.emptyState.medication.{title,description,cta}
- insights.emptyState.bmi.{title,description,cta}
- insights.emptyState.sleep.{title,description,cta}