unify command-mode keybinds, add terminal keybinds

arch-user/config/sway/config.tmpl

@@ -82,6 +82,7 @@ bindsym --to-code {
 	$mod+w layout tabbed
 	$altmod+w split v; layout tabbed
 	$mod+u split none
+	$altmod+u split none
 	$mod+y layout stacking
 	$altmod+y split h; layout stacking
 }