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This PR fixes an intermittent backdrop flicker when opening the sheet
In some openings, the backdrop briefly renders at high opacity before animating correctly
(visual sequence like 1 -> 0 -> 0.1 -> 0.2, ...)
This happens because backdrop opacity is derived from
yProgress, andycan momentarily keep a stale value during the transition toopening, before theasync onOpenflow startsThe fix sets
ytoclosedYinuseIsomorphicLayoutEffectwhen state becomesopeningDoing this in layout phase guarantees the first painted frame starts from the closed position, preventing the flash and preserving the normal open animation