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/contextBindings.js

@@ -1,3 +1,4 @@
+import { t } from '../i18n/index.js';
 import { shouldExpandGlobalContextPanel } from '../rightRailPolicy.js';
 
 export function _initGlobalContextPanel() {
@@ -32,7 +33,7 @@ export function _initGlobalContextPanel() {
     void this._runUserFacingContextAction(
       (notificationToken) =>
         this._selectContextMode(nextMode, { notificationToken }),
-      'Contacts could not complete the requested transition; try again',
+      t('cockpit.context.toastTransitionFailedContacts'),
     ).then((succeeded) => {
       if (
         !this.destroyed &&
@@ -61,7 +62,7 @@ export function _initGlobalContextPanel() {
     void this._runUserFacingContextAction(
       (notificationToken) =>
         this._selectContextMode(nextMode, { notificationToken }),
-      'Space Missions could not complete the requested transition; try again',
+      t('cockpit.context.toastTransitionFailedMissions'),
     ).then((succeeded) => {
       if (
         !this.destroyed &&
@@ -108,11 +109,11 @@ export function _initGlobalContextPanel() {
       this.showToast(
         stats?.statusMessage ||
           (stats?.status === 'zoom-in'
-            ? 'Zoom in to search mapped installations'
-            : 'Nearby installations refreshed'),
+            ? t('cockpit.context.toastZoomToSearch')
+            : t('cockpit.context.toastInstallationsRefreshed')),
       );
       return true;
-    }, 'Nearby installations could not be refreshed; try again').finally(() => {
+    }, t('cockpit.context.toastInstallationsRefreshFailed')).finally(() => {
       if (this.destroyed) return;
       button.setAttribute('aria-disabled', 'false');
       button.setAttribute('aria-busy', 'false');