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/cctvBindings.js

@@ -1,3 +1,5 @@
+import { t } from '../i18n/index.js';
+
 export function _initCctvPanel() {
   if (!this._cctvPanel) return;
 
@@ -143,7 +145,7 @@ export function _initCctvPanel() {
       },
       { origin: 'user' },
     );
-    this.actions.showToast('CCTV calibration saved');
+    this.actions.showToast(t('cockpit.cctv.toastCalibrationSaved'));
   });
 
   this.listen(this._cctvCalibResetBtn, 'click', () => {