As the editor's design language keeps advancing and modernizing, it is also relevant to look at less-visible instances, like the spinner component, that retains currently an aged form, perhaps inherited from general WP:

And its position seems to be at odds, like in the below example of site editor and nav block. Not sure what the logic is here:

Here's the proposal, with diverse scales (64, 48, 24) and color combinations (upcoming blueberry3858E9 gray 300 DDDDDD gray 900 1E1E1E white FFFFFF) for potentially various contexts and circumstances: