chore(codebase): full cleanup pass

backend/Modules/Contents/Features/GetAlbum.cs

@@ -49,12 +49,12 @@ public class GetAlbumHandler(
         GetAlbumRequest request,
         CancellationToken ct)
     {
-        var album = await context
+        Album? album = await context
             .Albums
             .Include(a => a.Photos.OrderBy(p => p.Order))
             .SingleOrDefaultAsync(
                 a => a.Id == request.AlbumId,
-                cancellationToken: ct);
+                ct);
 
         if (album is null)
         {
@@ -62,7 +62,7 @@ public class GetAlbumHandler(
             return;
         }
 
-        var photos = album.Photos
+        List<AlbumPhotoDto> photos = album.Photos
             .Select(p => new AlbumPhotoDto(
                 p.Id,
                 p.OriginalUrl,