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/standalone/application.js

@@ -6,6 +6,8 @@ import { createStandaloneScene } from './scene.js';
 import { createStandaloneControls } from './controls.js';
 import { createStandaloneData } from './data.js';
 import { createStandaloneTools } from './tools.js';
+import { resolveLocale, applyDocumentLanguage } from '../i18n/locale.js';
+import { applyDocumentTranslations, setLocale } from '../i18n/index.js';
 
 // The existing controls and layer catalog contain page-scoped state.
 let constructed = false;
@@ -21,6 +23,14 @@ export function createStandaloneApplication({
   if (constructed)
     throw new Error('The standalone application already owns this page');
   constructed = true;
+  // Locale is resolved before any UI initialization so <html lang>/<html dir>
+  // and every catalog lookup agree from the first painted frame. Module
+  // scripts execute after parsing, so the DOM is ready here and every
+  // data-i18n* element honors the resolved locale without a reload.
+  const activeLocale = resolveLocale();
+  setLocale(activeLocale);
+  applyDocumentLanguage(document, activeLocale);
+  applyDocumentTranslations(document);
   const loadingScreen = document.getElementById('loading-screen');
   const loaderStatus = loadingScreen.querySelector('.loader-status');
   let placeSearch;