v0.99.0

Added

• ImageViewer — a picture that opens out of the page to the middle of the screen over a
  blur, for photos in a feed, a gallery grid or a post. Wrap each image in an
  ImageViewer.Trigger, or wrap content that already draws it, such as Post.Media.

  • Every trigger under one root is a page of the same gallery. Swipe sideways between them,
    and the thumbnail hidden underneath follows the page.
  • Pinch or double-tap to zoom. Drag the picture up or down, tap outside it, use the close
    button or press Android's back button to send it back into its thumbnail.
  • caption shows under the open picture. fullSource loads a larger copy once the viewer
    opens, so the page can carry small thumbnails.
  • inset and cornerRadius set the open picture's margin and corners, 16 points each by
    default. Pass 0 for both to fill the screen.
  • open, index and their onOpenChange / onIndexChange callbacks make it controlled.

  The picture moves from the thumbnail's own rectangle and corner radius to the whole image,
  so the crop opens out rather than a second copy fading in. Pass radius on a trigger to
  match its rounded-* class, because a class cannot be read back. The blur needs the
  optional expo-blur and falls back to a dim without it.

• Scrim — progress, a shared value from 0 to 1 that drives the backdrop instead of
  its own fade. The blur's radius tracks it, so an overlay dragged partway out can bring the
  page back into focus as it goes.

Docs

• Post — a "Photos that open" version and example: a single photo, a grid of four that is
  one gallery, and a media-first card, each opening in an ImageViewer.
• Home page — the heading and introduction above the component showcase are centred.