scene: sky-state seam (auto/day/dusk/night) with skyBackdrop #43
2026-11-09
scene: sky-state seam (auto/day/dusk/night) with a luminance bound per state
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getSkyState/setSkyState/subscribe over one localStorage key, default auto, tolerant of missing, invalid and refused storage. skyBackdrop(state) returns the darkest and lightest sky luminance the state can show. Tests measure login text and link contrast against it per state and theme. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>