feat(cockpit): render the utility strip's measured layout from the store

The Cockpit layout pass publishes the utility strip's fit to the
gev-cockpit store: the HUD's --cockpit-utility-* lengths, whether only the
expanded control fits, and whether a collapsed control beside an expanded
one is hidden from assistive technology. CockpitView renders the lengths
on the HUD and CockpitUtilityControls the strip's class and each control's
aria-hidden, which now also follows a popover opened between passes. Focus
leaves a control before the strip hides it. Exit publishes no layout,
which also clears the expanded height, class and aria-hidden the old exit
left behind. The briefing and Contact cards' positions stay imperative:
the same pass measures them straight after writing them.

src/ui/cockpitController.js

@@ -150,6 +150,7 @@ export class CockpitViewController {
     this.publishRoute = publish.route ?? (() => {});
     this.publishVision = publish.vision ?? (() => {});
     this.publishSignals = publish.signals ?? (() => {});
+    this.publishUtilityLayout = publish.utilityLayout ?? (() => {});
     this.presence = {
       active: false,
       entryAvailable: false,