feat(ui): render the Cockpit briefing card from a store

The Cockpit controller no longer writes the briefing card's pages, cycle
toggle, regional news and local conditions: it keeps them as plain state,
starting from cockpitBriefPages.js, and publishes a copy to a new
gev-cockpit store. A new CockpitBriefing component, lifted verbatim from
the Cockpit view, renders it. News rows are keyed by story, so a focused
link never turns into another story on refresh. The controls keep the
controller's listeners; the route card and the signal list keep their
owners' bindings for now. The boot-time kicker translation is gone, as
the card translates its own text.

src/ui/cockpitBriefPages.js

@@ -0,0 +1,76 @@
+/**
+ * The Cockpit briefing's pages and the state it starts in. It needs only the
+ * i18n module, so the controller and the view can both read it.
+ */
+import { msg, t } from '../i18n/index.js';
+
+export const COCKPIT_BRIEF_PAGES = [
+  {
+    id: 'signals',
+    kickerKey: msg('LIVE SIGNALS'),
+    subtitleKey: msg('OBSERVED / MAPPED PINGS'),
+    sourceKey: msg('SOURCE-BACKED EVENTS · NO SYNTHETIC NEWS'),
+  },
+  {
+    id: 'news',
+    kickerKey: msg('REGIONAL NEWS'),
+    subtitleKey: msg('LATEST LOCATION-MATCHED REPORTING'),
+    sourceKey: msg('{source} · LOCATION QUERY · RECENT'),
+    sourceName: 'GOOGLE NEWS RSS', // i18n-ignore: provider name
+  },
+  {
+    id: 'local',
+    kickerKey: msg('LOCAL INFO'),
+    subtitleKey: msg('PLACE / CONDITIONS / POSITION'),
+    // Attribution stays English.
+    source: 'NATURAL EARTH · OPEN-METEO · UTC',
+  },
+];
+
+// The cycle toggle's tooltip, as literal keys for the extractor.
+export const CYCLE_HELP_KEYS = Object.freeze({
+  on: msg(
+    'Stop automatic page cycling. Previous, Next, and the SIG/NEWS/LOCAL tabs stay available.',
+  ),
+  off: msg(
+    'Cycle briefing pages automatically every 9 seconds (Signals → News → Local). Pauses while you hover or focus the panel. Live signal data refreshes continuously either way.',
+  ),
+});
+
+/**
+ * The briefing as it first renders: the Live Signals page, cycling off, news
+ * still loading and no region yet. The controller keeps it, changes it in
+ * place and publishes a copy; `CockpitBriefing` renders it.
+ * @returns {object}
+ */
+export function createBriefState() {
+  const page = COCKPIT_BRIEF_PAGES[0];
+  return {
+    pageIndex: 0,
+    pageId: page.id,
+    kicker: t(page.kickerKey),
+    subtitle: t(page.subtitleKey),
+    position: `1 / ${COCKPIT_BRIEF_PAGES.length}`,
+    source: t(page.sourceKey),
+    autoRotate: false,
+    autoLabel: t('CYCLE OFF'),
+    autoHelp: t(CYCLE_HELP_KEYS.off),
+    regionalStatus: null,
+    news: {
+      statusHidden: false,
+      state: null,
+      status: t('ACQUIRING REGIONAL NEWS'),
+      articles: [],
+    },
+    local: {
+      place: t('RESOLVING REGION'),
+      coordinates: '--',
+      temperature: '—',
+      wind: '—',
+      windDirection: '—',
+      condition: t('UNKNOWN'),
+      cloud: '—',
+      precipitation: '—',
+    },
+  };
+}