Switch language in place, without a reload

Choosing a language in the picker now applies it at once. The choice is
stored and ?lang is kept in step through replaceState, and the picker keeps
focus.

Code that writes translated text itself re-presents it on a switch:
onLocaleChange() lets an owner listen, removed at teardown, and status
writers hand over a function of the locale (voice cards, scene director,
SDR, draw hints, imagery split, map sources, Bhote Koshi media) so the
words are rebuilt rather than re-sent. The HUD, cockpit, radio, CCTV,
launch, awareness and credit texts follow the same hook, and
applyDocumentTranslations can be applied again without undoing text code
wrote since.

The unsaved-work registry and persistLocaleAndReload existed only to guard
the reload, so they go, with their catalog entries.

src/voice/sessionCommands.js

@@ -3,7 +3,7 @@ import { createVoiceSession } from './session.js';
 import { VoiceCardControls } from './voiceCard.js';
 import { PointerReticle } from './pointerReticle.js';
 import { VOICE_PROVIDERS } from './providerCapabilities.js';
-import { msg, registerUnsavedWork, t } from '../i18n/index.js';
+import { t } from '../i18n/index.js';
 
 function createDefaultReticle(pointer) {
   const element = pointer?.element;
@@ -74,12 +74,13 @@ export function createVoiceCommands({
         })),
       }),
       value: provider,
-      title: [
-        t('Changing provider reconnects voice if it is on.'),
-        capabilities.advisoryLimit,
-      ]
-        .filter(Boolean)
-        .join(' '),
+      title: () =>
+        [
+          t('Changing provider reconnects voice if it is on.'),
+          capabilities.advisoryLimit,
+        ]
+          .filter(Boolean)
+          .join(' '),
     });
     ui.update('root', { provider });
   }
@@ -91,8 +92,8 @@ export function createVoiceCommands({
   ui.update('tier', { hidden: !capabilities.costControls });
   ui.update('cost', { hidden: !capabilities.costControls });
   if (!capabilities.pushToTalk) {
-    ui.update('button', { label: t('Toggle voice control') });
-    ui.update('help', { text: t('Activate to toggle voice') });
+    ui.update('button', { label: () => t('Toggle voice control') });
+    ui.update('help', { text: () => t('Activate to toggle voice') });
   }
   // Retain the existing controller's inspection surface for browser tools.
   const controls = adapter.controller || session;
@@ -105,17 +106,17 @@ export function createVoiceCommands({
       ...(event.state === 'error' && { errorDismissed: false }),
     });
     // States are machine values; only the label is translated.
-    ui.update('status', { text: voiceStatusLabel(event.state) });
+    ui.update('status', { text: () => voiceStatusLabel(event.state) });
     // The portable session reports 'Voice off' in English: show the idle
     // label instead. Other details are provider messages, shown as they come.
     const idle = event.state === 'idle';
     const detail = event.detail === 'Voice off' ? '' : event.detail;
     ui.update('detail', {
-      text: detail || (idle ? t('Voice off') : t('Voice active')),
+      text: () => detail || (idle ? t('Voice off') : t('Voice active')),
     });
     ui.update('button', { pressed: session.isActive() });
     ui.update('error', {
-      text:
+      text: () =>
         event.state === 'error'
           ? event.detail || t('Voice could not be started.')
           : '',
@@ -169,10 +170,6 @@ export function createVoiceCommands({
     card?.outline(event);
     session.sendMapEvent({ type: 'map_annotation_outline', ...event });
   });
-  // A reload (the language switch) ends the conversation: ask first.
-  const unregisterUnsavedWork = registerUnsavedWork(() =>
-    session.isActive() ? msg('the active voice session') : null,
-  );
   const buttonHandler = () => {
     if (adapter.ignoreButtonClick?.()) return;
     if (session.isActive()) {
@@ -188,7 +185,6 @@ export function createVoiceCommands({
     cleaned = true;
     offButton();
     offProvider?.();
-    unregisterUnsavedWork();
     annotationUnsubscribe?.();
     updateStatus();
     updateCard?.();