Quickly deselecting all files

Deselecting files when in muliselect mode is unnecessarily difficult. Most file managers will deselect everything if you click in empty space or hit the esc key. I keep unintentional rearranging the ui by hitting esc when trying to get rid of a selection.

Look for the UI code handling multiselect mode and keyboard shortcuts, likely in the frontend JavaScript or Python web server logic. Start by searching for 'esc' or 'escape' key handling, then find where file selections are managed. Test by running the server, selecting multiple files, and pressing ESC to see current behavior. The fix should deselect all files on ESC or click in empty space.

Written by the indexing model from the issue text.