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/voice/realtimeConnection.js

@@ -1,3 +1,5 @@
+import { t } from '../i18n/index.js';
+
 const DISCONNECT_GRACE_MS = 6000;
 
 function releaseStartResources({ localStream = null, localPc = null } = {}) {
@@ -59,7 +61,7 @@ export class RealtimeConnection {
     this.input.pushToTalkKeyHeld = pushToTalkKeyHeld;
     this.input.spaceKeyHeld = spaceKeyHeld;
     if (!window.RTCPeerConnection || !navigator.mediaDevices?.getUserMedia) {
-      this.setStatus('error', 'WebRTC microphone support unavailable');
+      this.setStatus('error', t('setup.voice.detail.microphoneUnavailable'));
       return;
     }
 
@@ -78,7 +80,7 @@ export class RealtimeConnection {
     // — this is what "applies next session" means.
     this.cost.prepareSession();
     this.syncCostUi();
-    this.setStatus('connecting', 'Requesting microphone');
+    this.setStatus('connecting', t('setup.voice.detail.requestingMicrophone'));
     this.debugLog('session.starting', {
       epoch,
       tier: this.cost.voiceTier,
@@ -176,9 +178,9 @@ export class RealtimeConnection {
         if (!ownsChannel()) return;
         const detail = this.input.pushToTalkMode
           ? this.input.pushToTalkKeyHeld
-            ? 'Release Space to send'
-            : 'Hold Space to talk'
-          : 'Ask or command';
+            ? t('setup.voice.detail.releaseSpaceSend')
+            : t('setup.voice.detail.holdSpaceTalk')
+          : t('setup.voice.detail.askOrCommand');
         this.setStatus('listening', detail);
         this.debugLog('data_channel.open', {
           connection: this.connectionDiagnostics(dataChannel),