Boom, customisable trading layouts using react-grid-layout, complete with edit mode and reset. Claude honestly struggled very hard with this. Partially it was using the library incorrectly a lot despite having MCP doc server, and I had to really force it to read usage docs online. Secondly because this was highly interaction dependent to test, required a lot of dragging panels which the chrome automation is fairly slow and cumbersome to do (every interaction is 10s+, feels sloooow) Overall had to intervene quite a lot, and even despite that it still could not figure out certain places in which it had mangled the CSS could not identify the UI looked off. To its credit, I would rate this as a fairly hard feature to pull off in such a short timeframe.