feat(surface): <Surface> primitive — paint / layer / hit-test / elevation / backdrop (A23)#90

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feat/surface-primitive

May 17, 2026

Commits on May 17, 2026

feat(surface): SurfaceProps types + resolveZIndex layer helper (A23)

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feat(surface): shadowCells pure cell math for elevation 0-5 (A23)

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feat(jsx): declare surfaceHitTestBoundary + surfaceElevation ink-box attrs (A23)

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feat(hit-test): honor surfaceHitTestBoundary attribute (A23)

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feat(render): paint Surface elevation shadow before ink-box content (A23)

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feat(warn): dev warnings for non-absolute Surface flags (A23)

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feat(surface): Surface React shell + tests + barrel (A23)

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feat(api): export Surface from package index (A23)

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refactor(Draggable): paint outer Box through Surface (A23)

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refactor(Resizable): paint outer Box through Surface clip='hidden' (A23)

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feat(examples): surface demo — layer stack, backdrop, elevation, boundary, composition (A23)

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docs(surface): component reference, internals, cross-refs, changelog, CLAUDE.md, AGENTS.md (A23)

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fix(surface): Box flex defaults + clear shadow extent (codex review on #90)

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