feat(cockpit): render the Contact and briefing cards' collapse from the store

Cockpit presence now carries contextCollapsed and signalCollapsed.
setContextCollapsed and setSignalCollapsed update presence and republish
it only when the value changes, instead of writing the dataset and the
toggle attributes. CockpitContext and CockpitBriefing bind data-collapsed
and their toggles' aria-expanded, aria-label, title and icon from
presence. The Cockpit utility QA script waits a frame for Vue to render
before it reads the toggles.

CHANGELOG.md

@@ -118,6 +118,11 @@
   that there is no panel to open instead of writing its classes
   (samehkhamis).
 
+- The Cockpit Contact and briefing cards' collapse renders from the
+  `gev-cockpit` store: the controller publishes `contextCollapsed` and
+  `signalCollapsed` in its presence, and each card's `data-collapsed` and
+  its toggle's state, words and icon follow it (samehkhamis).
+
 ## [0.3.0] — 2026-10-27 — Street Level, On Your Phone, in Your Language
 
 - Show a Street Level view facing 359.5° or more as 0°. The viewer caption