Looks like a React component tree binding to SVG nodes. Right click and inspect element. Right click on the svg element in the (chrome) inspector. Choose `break on` > `subtree modifications`. That led me to look through the network tab for this: https://cursor.com/marketing-static/_next/static/chunks/0sqf... (look for the text "GitObject" in this file)

Cursor's entire schtick is providing AI coding tools. I'll give you one guess as to what they probably used for the diagrams.