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/cockpitController.js

@@ -64,6 +64,7 @@ export class CockpitViewController {
       getInitialVisionMode = null,
       onCameraTakeover = null,
       isEntryAllowed = null,
+      isUtilityDisclosureOpen = null,
       onEntered = null,
       onExited = null,
       restoreTrackingFrame = null,
@@ -112,6 +113,10 @@ export class CockpitViewController {
         : () => false;
     this.isEntryAllowed =
       typeof isEntryAllowed === 'function' ? isEntryAllowed : () => true;
+    this.isUtilityDisclosureOpen =
+      typeof isUtilityDisclosureOpen === 'function'
+        ? isUtilityDisclosureOpen
+        : () => false;
     this.context = document.getElementById('cockpit-context');
     this.contextPrevious = document.getElementById('cockpit-context-previous');
     this.contextNext = document.getElementById('cockpit-context-next');