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fix: preserve moving-surface image handoffs through native return - #44
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Images carried by a moving DOM surface can diverge from fixed Native snapshot copies, or disappear before the returning renderer is ready.
Add an opt-in DOM-surface handoff. The same decoded image follows its source and moves to a viewport transfer layer during entry and return. Return stages concealed Native layout, optionally aligns to measured frames, and waits for an accepted reveal revision newer than the layout revision before retiring the image. Unavailable alignment is not renderer failure. Active image ownership is independent of reusable capture-cache validity, so resizing and immediate reversal cannot leave orphaned pixels.
On iOS, renderer-view capture preserves exterior transparency. Reference-counted pixel concealment keeps layout measurable and restores interaction/accessibility after the last lease ends. Android accepts DOM-surface tokens without installing fixed Native copies. Default composited capture retains its existing route.
Tests cover immediate reversal after resize, invalid-source cleanup, optional geometry, stale acknowledgements, transparent capture and overlapping concealment leases. Captured glass interiors can retain backdrop information; this does not reproduce live refraction.