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/ui/cockpitInstruments.js

@@ -1,4 +1,5 @@
 /** Instrument values, routes and vision controls for the Cockpit controller. */
+import { t } from '../i18n/index.js';
 import {
   COCKPIT_VISION_MODES,
   normalizeCockpitVisionMode,
@@ -31,7 +32,10 @@ export function updateHud(
   const heading = normalizeHeading(this.heading ?? info.track ?? 0);
   if (this.callsign) {
     this.callsign.textContent =
-      info.callsign || info.registration || info.icao24 || 'AIRCRAFT';
+      info.callsign ||
+      info.registration ||
+      info.icao24 ||
+      t('cockpit.hud.fallbackCallsign');
   }
   const speedKt = Number.isFinite(info.velocityMps)
     ? info.velocityMps * 1.94384
@@ -126,14 +130,22 @@ export function updateHud(
     this.position.textContent = `${lat} · ${lon}`;
   }
   if (this.aircraftMeta) {
+    // State-sibling keys at the writer: each feed state translates
+    // independently so no state can leak English under other locales.
     const feedState = this.surfaceAcquiring
-      ? 'ACQUIRING SURFACE'
+      ? t('cockpit.hud.metaFeedAcquiringSurface')
       : this.surfaceFallback
-        ? 'SURFACE FALLBACK'
+        ? t('cockpit.hud.metaFeedSurfaceFallback')
         : info.stale
-          ? 'STALE FEED'
-          : 'LIVE TRACK';
-    this.aircraftMeta.textContent = `${info.layerId === 'military' ? 'MILITARY' : 'COMMERCIAL'} · ${feedState} · COURSE ALIGNED`;
+          ? t('cockpit.hud.metaFeedStale')
+          : t('cockpit.hud.metaFeedLive');
+    this.aircraftMeta.textContent = t('cockpit.hud.aircraftMetaTemplate', {
+      aircraftClass:
+        info.layerId === 'military'
+          ? t('cockpit.hud.metaClassMilitary')
+          : t('cockpit.hud.metaClassCommercial'),
+      feedState,
+    });
   }
   this.updateRoute(info);
   if (
@@ -158,13 +170,14 @@ export function updateRoute(info) {
   const validDestination =
     Number.isFinite(destination?.lat) && Number.isFinite(destination?.lon);
   const routeLabel = (airport) =>
-    [airport?.code, airport?.name].filter(Boolean).join(' · ') || 'UNKNOWN';
+    [airport?.code, airport?.name].filter(Boolean).join(' · ') ||
+    t('cockpit.route.unknownEndpoint');
   if (this.routeFrom) this.routeFrom.textContent = routeLabel(origin);
   if (this.routeTo) this.routeTo.textContent = routeLabel(destination);
   if (this.routeStatus) {
     this.routeStatus.textContent = validDestination
-      ? 'ARROW · ESTIMATED DIRECTION'
-      : 'ROUTE DATA UNAVAILABLE';
+      ? t('cockpit.route.statusArrowEstimated')
+      : t('cockpit.route.statusUnavailable');
   }
   if (this.route) this.route.hidden = !origin && !destination;
   if (
@@ -198,7 +211,9 @@ export function updateRoute(info) {
     );
   }
   if (this.routeDirectionLabel) {
-    this.routeDirectionLabel.textContent = `DEST ${String(Math.round(destinationBearing)).padStart(3, '0')}°`;
+    this.routeDirectionLabel.textContent = t('cockpit.route.directionLabel', {
+      bearing: `${String(Math.round(destinationBearing)).padStart(3, '0')}°`,
+    });
   }
 }
 
@@ -206,12 +221,16 @@ export function syncWeatherToggle(enabled) {
   if (!this.weatherToggle) return;
   const active = !!enabled;
   this.weatherToggle.setAttribute('aria-pressed', String(active));
-  this.weatherToggle.setAttribute(
-    'aria-label',
-    `${active ? 'Disable' : 'Enable'} cockpit weather effects`,
-  );
-  this.weatherToggle.title = `${active ? 'Disable' : 'Enable'} cockpit weather effects`;
-  if (this.weatherState) this.weatherState.textContent = active ? 'ON' : 'OFF';
+  const weatherLabel = active
+    ? t('cockpit.context.weatherDisableAriaLabel')
+    : t('cockpit.context.weatherEnableAriaLabel');
+  this.weatherToggle.setAttribute('aria-label', weatherLabel);
+  this.weatherToggle.title = weatherLabel;
+  if (this.weatherState) {
+    this.weatherState.textContent = active
+      ? t('cockpit.context.weatherStateOn')
+      : t('cockpit.context.weatherStateOff');
+  }
 }
 
 export function setVisionMode(mode, { revealParameters = false } = {}) {
@@ -230,17 +249,19 @@ export function setVisionMode(mode, { revealParameters = false } = {}) {
   const names = {
     optical: inherited,
     crt: 'CRT',
-    nvg: 'Night vision',
-    thermal: 'Thermal',
-    noir: 'Noir',
+    nvg: t('cockpit.vision.styleNameNightVision'),
+    thermal: t('cockpit.vision.styleNameThermal'),
+    noir: t('cockpit.vision.styleNameNoir'),
   };
   if (this.visionCurrent) {
     this.visionCurrent.dataset.cockpitVision = next;
     this.visionCurrent.setAttribute(
       'aria-label',
-      `Current cockpit vision style: ${names[next]}. Activate for next style.`,
+      t('cockpit.vision.currentAriaTemplate', { style: names[next] }),
     );
-    this.visionCurrent.title = `Current style: ${names[next]} — click for next`;
+    this.visionCurrent.title = t('cockpit.vision.currentTitleTemplate', {
+      style: names[next],
+    });
   }
   if (this.visionCurrentLabel)
     this.visionCurrentLabel.textContent = labels[next];