Two UX fixes for the peek preview:
1. Black flash on first peek — the preview VC now depends on SDWebImage
directly (same version pinned by expo-image) and reads from
`SDImageCache.shared`. On open it paints the fullsize synchronously if it's
cached (common, since onPressIn prefetches), otherwise paints the thumb as a
placeholder while the fullsize loads and swaps in. Also switches the image
view to autoresizingMask so the dismiss animation interpolates cleanly
without AutoLayout relayout mid-animation.
2. Two-stage dismiss animation on aspect-mismatched thumbnails — drop the
explicit `previewForDismissingMenuWithConfiguration` override. With only
the highlight provider implemented iOS reverses it end-to-end, which
interpolates size and position together instead of snapping back to the
preview's original size before translating.
https://claude.ai/code/session_015REmux3R9uuEMMJUHxTyQT
Claude
1856c36221