Keyword commands act on the selected photos, or on the active photo
when the selection is empty (`Session::targets`), but the Keywording
box, the keyword set's buttons, the suggestions and the Keyword List's
tick boxes read the selection only: with just an active photo the box
showed nothing while typed keywords went to it. They now all use the
photos the commands use.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>