Native HTML5 drag starts after ~4px of pointer travel and suppresses the
click event for the gesture, so the draggable sidebar file tree rows
randomly ignored clicks on macOS trackpads/Magic Mouse: folders neither
expanded nor collapsed and files did not open.
Keep the rows draggable (dragging a file into the chat input inserts an
@mention) and recover the suppressed click on dragend: a drag that ended
within a small slop radius of its origin without dropping anywhere runs
the row's primary action. Also drop the misleading grab cursor so rows
read as clickable, matching FilesView.
Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>
