msg fom a year ahead, it was slightly hard to achieve this, but I finally did it with simple compose (commonMain) APIs on desktop target 😄 it seems its not beyond compose at all !
animating desktop targets' window size is possible even with ease functions (fastoutslowin etc)/
also possible with transparent background window without a decoration, you can also toggle between a small island bar, and a full size window, you can also grab a global hotkey on OSX, and make it toggle & animate between screen sizes
demo: