Pins three contracts at the Pixel-5 viewport that the Vitest specs
can't see: no horizontal page scroll, exactly one pill per card with
the connected `data-state` marker, and the v1.4.18 redundant banner
is gone from the rendered DOM. Stubs all three integration endpoints
so no real Withings/Mood Log credentials are needed in CI.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>