feat(i18n): presentation extraction — t() call sites, data-i18n templates, locale selector

Route every application-owned presentation string through the i18n
core: t() call sites across the app/layers/ui/data/voice surfaces,
data-i18n* attributes in the src/ui/templates/*.html markup (applied at
boot by applyDocumentTranslations from src/standalone/application.js),
and the dock locale selector (runtime-rendered from the offered pair —
a single EN button while only English ships).

Rebased onto current main, where the extraction follows the module
splits: the shell wiring now lands in the owner modules
(panelChrome, visualSettings, locationNavigation, shareRestoration,
shellFeedback, applicationShell) and the voice status corpus in the
realtime* modules; scene status lives in director.js +
playbackAdapter.js.

Modules shared with the node runtime (loadingFeedback,
installationFeedback, regionalModel, keySetupCore, vessels ingestion)
stay environment-neutral English and localize at their browser render
sites (chip maps in shellFeedback/installations controls, the weather
table in cockpitBriefing, keySetupRequirementEnvVars compositions), so
the package-boundary graph stays clean; the browser boundary groups
now own the i18n modules they reach (scripts/package-boundaries.json).

src/layers/vessels/lifecycle.js

@@ -1,9 +1,6 @@
 import { VESSEL_OVERLAY_SOURCE_ID } from '../../data/vesselLabels.js';
-import {
-  AIS_FIRST_CONNECT_GRACE_MS,
-  AIS_FIRST_CONNECT_LABEL,
-  AIS_HEALTHY_STATUSES,
-} from './policy.js';
+import { t } from '../../i18n/index.js';
+import { AIS_FIRST_CONNECT_GRACE_MS, AIS_HEALTHY_STATUSES } from './policy.js';
 
 export function createLifecycle({
   vesselState,
@@ -41,7 +38,7 @@ export function createLifecycle({
     state.feed.firstConnectStartedAt = startedAt;
     state.feed.firstConnectDeadline = startedAt + AIS_FIRST_CONNECT_GRACE_MS;
     state.feed.error = null;
-    state.feed.loadingLabel = AIS_FIRST_CONNECT_LABEL;
+    state.feed.loadingLabel = t('layers.vessel.awaitingFirstPosition');
     scheduleFirstConnectExpiry(sessionId, AIS_FIRST_CONNECT_GRACE_MS);
   }
 
@@ -63,8 +60,8 @@ export function createLifecycle({
       state.feed.firstConnectPhase = 'unavailable';
       state.feed.loadingLabel = '';
       state.feed.error = state.feed.lastMessageAt
-        ? 'awaiting usable AIS positions…'
-        : 'awaiting first AIS message…';
+        ? t('layers.vessel.awaitingPositions')
+        : t('layers.vessel.awaitingFirstMessage');
       state.feed.stale = state.feed.count > 0;
     }, delayMs);
   }