Carousel: change circle border depending on view status

[mxbclang]

Feature Description

A user in the forum requested changing the circle border color on Circle Carousel block stories based upon if the user has already viewed them or not, similar to Instagram's story behavior.

Their specific request: "Maybe using browser cache, the stripe around unseen stories can be colored. Seen and invisible cookies…"

[halilesen]

or

This attracts the attention of users. They notice when a story is updated or a new one is added.