feat(materials): add campaign materials overlay for sessions

Let GMs manage and show images over the scene from the editor and control panel, with zoom tools, help docs, and full ru/en i18n.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/renderer/editor/i18n/EditorI18nContext.tsx

@@ -1,4 +1,4 @@
-import React, { createContext, useCallback, useContext, useMemo, useState } from 'react';
+import React, { createContext, useCallback, useContext, useEffect, useMemo, useState } from 'react';
 
 import {
   EDITOR_LOCALE_STORAGE_KEY,
@@ -36,6 +36,16 @@ export function EditorI18nProvider({ children }: { children: React.ReactNode })
     }
   }, []);
 
+  // Другие окна Electron (пульт, материалы) подхватывают смену языка из редактора.
+  useEffect(() => {
+    const onStorage = (e: StorageEvent) => {
+      if (e.key !== EDITOR_LOCALE_STORAGE_KEY) return;
+      setLocaleState(normalizeEditorLocale(e.newValue));
+    };
+    window.addEventListener('storage', onStorage);
+    return () => window.removeEventListener('storage', onStorage);
+  }, []);
+
   const t = useCallback(
     (key: string, vars?: Record<string, string | number>) => translateEditorMessage(locale, key, vars),
     [locale],