9f503c011d2f8f64945dc7517d1334def717a370
Previous approach (CSS transition + reflow trick) is unreliable in Firefox. New approach: PhotoSwipe emits 'change' synchronously before painting; we add a direction-aware CSS keyframe animation to the incoming slide element, with animation-fill-mode:both so there is no flash before the animation starts. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Vgmzx8VTTTmCskSpQtsLTr
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