There's not a way to give evidence for this kind of stuff but that's feeling it gave me too. I suspect a lot of superfluous stuff implemented in recent software is implemented by an agent. I haven't formed a concrete opinion on how I feel about it though.
They're all in regards to design choices or why something is needed when it's not obvious. And such a level of polish in the interface isn't something you attain through prompting. Not AI.
I don't really know what to tell you but the comments are definitely Claude. The result is pretty good but AI was definitely involved in the creation of this.
The progress bar are vectors and not pixelated like they should be. A pretty obvious detail they should not have missed, but I understand how that could be harder to implement.