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>

1 files changed, 30 insertions, 0 deletions

diff --git a/app.rb b/app.rb
index 2cd40b2..1fc5f69 100644
--- a/app.rb
+++ b/app.rb
@@ -96,6 +96,11 @@ helpers do
         taken_at: meta['taken_at'],
         width:    meta['width'],
         height:   meta['height'],
+        duration: meta['duration'],
+        camera:   meta['camera'],
+        aperture: meta['aperture'],
+        shutter:  meta['shutter'],
+        iso:      meta['iso'],
       }
     end
 
@@ -118,11 +123,36 @@ helpers do
                    name:  name,
                    title: sub_data['title'] || name,
                    cover: album_cover(sub_dir, sub_data),
+                   count: media_count(sub_dir, sub_data),
                  }
                end
     data['sort_reverse'] ? albums.reverse : albums
   end
 
+  def media_count(dir, data)
+    files = data['files'] || {}
+    direct = Dir.children(dir)
+                .count { |n| MEDIA_EXTS.include?(File.extname(n).downcase.delete_prefix('.')) &&
+                             (admin? || (files[n] || {}).fetch('visible', true)) }
+    sub_total = Dir.children(dir)
+                   .select { |n| !n.start_with?('.') && File.directory?(File.join(dir, n)) }
+                   .sum do |n|
+                     sub_dir  = File.join(dir, n)
+                     sub_data = load_album(sub_dir)
+                     next 0 if sub_data['visible'] == false && !admin?
+                     media_count(sub_dir, sub_data)
+                   end
+    direct + sub_total
+  end
+
+  def format_duration(secs)
+    return nil unless secs
+    s = secs.to_i
+    h, s = s.divmod(3600)
+    m, s = s.divmod(60)
+    h > 0 ? format('%d:%02d:%02d', h, m, s) : format('%d:%02d', m, s)
+  end
+
   def album_cover(dir, data)
     cover = data['cover']
     return cover if cover && cover != '__random__' && File.exist?(File.join(dir, cover))