extend hover previews to sidepanel (esp. related content!)

as sidepanel is getting really useful these days, and the semantic connections revolution advances in/for Capacities, it would be great to see that great new QoL feature (mini-preview while hovering over object references) also for the pumped up sidepanel – especially the "related content" list, where quick glancing, browsing & peeking makes extraordinary cognitive/exploratory sense…!