sidepanel refactor

[davidmenendez]

while trying to address #4966 i took a closer look at SidePanel and i think it needs to be cleaned up. Namely it needs to be broken up into separate component pieces like body, footer, header, etc. there's too much going on in this single file and too much logic is present in the HTML

additionally the click outside functionality needs to be looked at. in #4968 i implemented a hook to check the user preference for reduced motion, but for some reason SidePanel is the only component that was having an issue with it. i suspect it's because there's something funky going on with the various effects going on here. these effects should also be looked at and cleaned up.