Adds `role="dialog"`, `aria-modal="true"`, and `aria-label` to the `.overlay` container to improve screen reader accessibility. Also adds `aria-expanded` and `aria-controls` to the EXIF info toggle button, linking it to the newly ID'd `#exif-panel`.
Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Adds a keyboard shortcut (`i` or `I`) to toggle EXIF info in the Lightbox component. Also adds descriptive `title` tooltips with keyboard shortcut hints to all interactive buttons (Close, Previous, Next, Info) in the Lightbox overlay.
This improves accessibility and the overall user experience by providing more discoverable navigation options.
Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
