feat(ui): show and hide the Cockpit surfaces from a store

The Cockpit controller publishes which surfaces are shown (the entry
button and TR-3B chip, the HUD with its exit and reset buttons and
briefing card, and the Contact card) and the views bind them. Focus moves
to the exit button, and back to the entry, after Vue renders them.

Layout scheduling counts the published presence as visible, so entry
still lays out the cards. The Display portal restores only focus its move
dropped. The Missions layer no longer hides the Contact card directly.

docs/VUE-MIGRATION.md

@@ -155,9 +155,14 @@ a feature supplying only its accent.
    before the focused row is removed, so a keyed list reorders several times
    a second without dropping keyboard focus. The instruments publish on
    every HUD update (about 10 Hz); in a dev build their Vue patch costs
-   about 0.5 ms, close to the DOM writes it replaced. The controls keep the
-   controller's listeners, and the cards' visibility, collapse and layout
-   stay with the controller. `CockpitUtilityControls` renders the Display
+   about 0.5 ms, close to the DOM writes it replaced. The controller also
+   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.
+   `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
    Display popover's slots stay static for the Cockpit display portal).