v1.11.0

Changed

• MediaGallery lightbox migrated from raw @radix-ui/react-dialog to the
  shadcn Dialog wrapper (Dialog, DialogPortal, DialogOverlay,
  DialogClose, DialogTitle from @/components/ui/dialog).
  Visually-hidden DialogTitle added for screen-reader accessibility.

Added

• Lightbox keyboard navigation: ArrowLeft / ArrowRight keys step through
  images; Escape closes (handled by Radix).
• 14 Vitest unit tests for MediaGallery covering gallery grid rendering
  (1 / 2 / 4 / 5+ images, overflow badge) and full lightbox interaction
  (open, close, prev/next buttons, arrow-key navigation, boundary clamping).
  Total Vitest count: 84 (was 70).