Investigate proper virtualisation of image scroll view

[Webreaper]

Probably going to be complex, but it's probably important. Also, consider the timeline scrolling requirement from here: https://www.reddit.com/r/damselflyphotos/comments/qz13ao/hows_the_ux_for_browsing_100000_photos/

Reference: https://github.com/dotnet/aspnetcore/blob/a450cb69b5e4549f5515cdb057a68771f56cefd7/src/Components/Web/src/Virtualization/Virtualize.cs