View transition ScratchList preset unloaded state into loaded state

[bates64]

And possibly other loading states in other components.

Originally posted by @bates64 in #1139 (comment)

[bates64]

https://developer.chrome.com/docs/web-platform/view-transitions/

[wearrrrr]

Currently I believe this is locked behind something in chrome://flags, but it can be emulated using a router, which I know astro has an open source implementation for, which should be easy enough to implement

[wearrrrr]

I stand corrected, the View Transitions api for non cross origin documents has been implemented in chrome for a while now.