One rule, two forms: useOrderItems (Top / Up / Down / Bottom rows of a row
menu) and OrderButtons (four buttons with the place, or a compact Up / Down
pair). A move that would go nowhere is shown off.
- YouTube playlist rows: the four moves now come from useOrderItems.
- Plex playlist rows: a block among the blocks, an episode within its show,
off while a write is in flight; drag and menu share moveBlock/moveEpisode.
- Saved views editor: the selected view's four buttons (owner: A), and the
grip's keyboard pick-up (its instructions promised one it did not have).
- Side panel groups in edit mode: an Up / Down pair (owner: A); a group the
stored order does not hold yet moves too; the name wraps there.
- The grip's touch-action: none is now test-held.
