The Culture Feed Holds Its Place While You Scroll

Environment: Dev & QA
The feed could go blank mid-scroll while it refreshed itself, and posts you had already scrolled past could reappear as the running order rebuilt underneath you.
The feed now keeps showing what it already has while new posts load, locks the order once you start scrolling, and fetches the next batch before you reach the end. Wide and tall images fit inside the card instead of being cropped. Copying a link to a post now reliably copies it, and tells you whether it worked.