WHOOP 4.0: steps and calories read 0/7 — add the motion-derived estimate #1149

Source: real WHOOP 4.0 capture noop-capture-260808-1527.txt + strap log (9.3.2-staging, 2026-08-08). Companion to #1144.

Strap log Recent 7d (my-whoop): sleep=7/7 recovery=7/7 steps=0/7 kcal=0/7. Recovery + sleep are fully populated, but steps and calories are empty for every day — the known 4.0 "no step count over BLE" gap. The WhoopModelComparison screen already promises 4.0 steps as an estimate; surface a motion-derived step/calorie estimate (clearly labelled) so those two tiles aren't blank for every 4.0 user. See also #568/#585 (imported steps) — this is the native/live-strap estimate.