0.36.0 — ImageLightbox `capNatural`: stop upscaling small sources

Added

• ImageLightbox gains a capNatural prop. By default the modal opens
  fitted to the viewport, which upscales a small source (e.g. a low-res GIF or
  screenshot) until it looks soft. Set capNatural and the open fit is clamped
  to the source's natural resolution (100%, 1 source px = 1 screen px), so small
  images stay crisp while larger ones fit the viewport exactly as before. It only
  bounds the initial open; pair it with maxZoom={1} to also stop the extended
  zoom controls from magnifying past 100%. Needs the natural pixel size (from
  width/height or the loaded image) — until that's known the image fits the
  viewport, then snaps to the cap once measured.