Recordings board and downloads update

We have redesigned the Recordings page in the left workspace sidebar into a clearer board view with separate columns for Recording, Completed, and Failed. We have also moved card actions into the menu on each recording, so preview, download, and delete are in one consistent place.

We have updated downloads so finished video files are prepared automatically when needed, and failed download attempts can be retried from the same Download action. This has made it easier to recover older or failed recordings, though some items may briefly show “Preparing export” before the file is ready to download.