Proofing Gallery 0.7.0

• radically modernize public galleries with configurable compact and immersive
  openings, refined glass surfaces, responsive controls, and animated viewing
• preserve complete portrait and landscape photographs in justified grids and
  replace cropped list strips with a useful photographic contact sheet
• make the lightbox touch-safe with tap-to-toggle controls, bidirectional swipe
  navigation, pinch zoom, two visible arrows, and a hideable session filmstrip
• keep culling navigation and virtualized side or bottom filmstrips within the
  viewport across large collections and narrow mobile layouts
• add a reproducible 30-photo local Studio library and six polished desktop and
  mobile screenshots for the Nextcloud App Store