feat(ui): render the Cockpit utility launchers and compact Radio controls from a store

The Display and Radio launchers, their popovers and the compact Radio
transport, Enable button and volume now render from the Radio store.
RadioControls owns the disclosure state; Cockpit Escape and the Display
reveal read that state instead of the DOM, and the Enable toggle guards
re-presses synchronously. The compact transport reuses the panel's
transport state and adds only its glyph and title.

src/ui/shellFacade.js

@@ -948,6 +948,10 @@ export class ShellFacade {
     return this._radioControls?._setCockpitDisclosure?.(...args);
   }
 
+  _cockpitDisclosureOpen(kind) {
+    return Boolean(this._radioControls?._cockpitDisclosureOpen?.(kind));
+  }
+
   _renderRadioState(...args) {
     return this._radioControls?._renderRadioState?.(...args);
   }