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.

docs/VUE-MIGRATION.md

@@ -240,9 +240,11 @@ a feature supplying only its accent.
    publishes which surfaces are shown: the entry button and TR-3B chip in
    the Context panel, the HUD with its exit and reset buttons and briefing
    card, and the Contact card. Focus moves to the exit button, and back to
-   the entry, only after Vue renders them. The controls keep the
-   controller's listeners, and the cards' collapse and layout stay with the
-   controller, which reads their visibility when it lays them out.
+   the entry, only after Vue renders them. The cards' collapse is part of
+   that presence too: each card's `data-collapsed` and its toggle's words
+   and icon render from it. The controls keep the controller's listeners,
+   and the cards' layout stays with the controller, which reads their
+   visibility when it lays them out.
    `CockpitUtilityControls` renders the Display
    and Radio launchers, which popover is open and the compact Radio
    controls from the `gev-radio` store that RadioControls publishes to; the