Add photo counts, EXIF details, video duration badges, slideshow launcher UI

- Album cards show recursive photo count (bubbles up through sub-albums).
- Lightbox info panel shows camera, aperture, shutter speed, and ISO;
  update.rb now extracts and stores these EXIF fields.
- Video thumbnail cards show a duration badge (e.g. "1:23").
- Slideshow launcher redesigned: button on its own line, with Shuffle /
  Full screen / Interval options on a second line, all inside a rounded
  border to make the grouping clear.
- Fixed album-actions alignment so Interval sits level with the checkboxes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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