feat(client): localize composer hints and rework input command interaction

Unify the /plan claimed hint with the plan placeholder through a locale
namespace, localize slash menu group titles, replace the PermissionSelect
native select with the Menu primitive, add a goal pause verb chain, clamp
anchored popups to the viewport with scroll-into-view and outside-dismiss,
and fix onPasteUpgrade insertedRange to account for the chip trailing gap.

packages/client/ui-plan/src/client/PlanModeControl.module.css

@@ -39,13 +39,10 @@
   display: inline-flex;
   align-items: center;
   color: var(--dsw-alias-label-caption);
-  opacity: 0;
-  transition: opacity 0.12s ease;
 }
 
 .chip:hover .close,
 .chip:focus-visible .close {
-  opacity: 1;
   color: var(--dsw-alias-label-secondary);
 }