i18n: language picker in the bottom-right corner

Replaces the EN/ES/RU buttons in the Visual Presets dock with a picker
that scales to many languages: a globe button with the current code
next to the POWER UP chip, opening a list of languages named in their
own language with their codes, the current one first and checked. A
search field appears past 8 languages. Keyboard: arrows, Home/End,
Enter/Space, Esc, type-ahead; keys stay in the list while it is open.
Choosing a language still asks before dropping unsaved work, then
reloads. Phones get the globe alone and a full-width sheet; the layout
uses logical properties for right-to-left languages.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/i18n/locale.js

@@ -8,7 +8,8 @@ export const LOCALE_STORAGE_KEY = 'gev:locale:v1';
 export const DEFAULT_LOCALE = 'en';
 
 /**
- * Shipped locales, in selector order. Adding one: locales/<code>.json, an
+ * Shipped locales. The picker (src/ui/localePicker.js) lists the active one
+ * first and the rest by LOCALE_NAMES. Adding one: locales/<code>.json, an
  * import in index.js, and an entry here (see docs/TRANSLATORS.md).
  */
 export const LOCALES = Object.freeze(['en', 'es', 'ru']);

src/i18n/locales/es.json

@@ -22,7 +22,11 @@
   "Globe actions": "Acciones del globo",
   "Reset camera and return to full globe view": "Restablecer la cámara y volver a la vista del globo completo",
   "loading frames": "cargando fotogramas",
-  "Language": "Idioma",
+  "Language: {language}": "Idioma: {language}",
+  "Change the interface language": "Cambiar el idioma de la interfaz",
+  "Interface language": "Idioma de la interfaz",
+  "Search languages": "Buscar idioma",
+  "No matching languages": "No hay idiomas que coincidan",
   "Loading Google 3D Tiles...": "Cargando Google 3D Tiles...",
   "Loading the keyless globe...": "Cargando el globo sin clave...",
   "Initializing systems...": "Inicializando sistemas...",

src/i18n/locales/ru.json

@@ -688,7 +688,11 @@
   "Keep location tray open": "Держать панель места открытой",
   "Search any location": "Поиск любого места",
   "Navigation, voice, and visual preset controls": "Управление навигацией, голосом и визуальными пресетами",
-  "Language": "Язык",
+  "Language: {language}": "Язык: {language}",
+  "Change the interface language": "Сменить язык интерфейса",
+  "Interface language": "Язык интерфейса",
+  "Search languages": "Поиск языка",
+  "No matching languages": "Подходящих языков нет",
   "Search location by name or coordinates": "Поиск места по названию или координатам",
   "Search any location...": "Поиск любого места...",
   "Normal": "Обычный",