Load monaco editor from local installation

frontend/package.json

@@ -20,6 +20,7 @@
     "format:check": "prettier --check \"src/**/*.{ts,tsx,css}\"",
     "check": "npm run lint && npm run format:check",
     "preview": "vite preview",
+    "postinstall": "mkdir -p public/monaco && cp -r node_modules/monaco-editor/min/vs public/monaco/vs",
     "test": "vitest run",
     "test:watch": "vitest",
     "test:coverage": "vitest run --coverage",
@@ -28,6 +29,7 @@
   "dependencies": {
     "@google/genai": "^0.6.0",
     "@monaco-editor/react": "^4.7.0",
+    "monaco-editor": "0.55.1",
     "@types/react-syntax-highlighter": "^15.5.13",
     "@wokwi/elements": "1.9.2",
     "@xterm/addon-fit": "^0.11.0",

frontend/src/main.tsx

@@ -1,4 +1,5 @@
 import { createRoot } from 'react-dom/client';
+import { loader } from '@monaco-editor/react';
 import './index.css';
 // Side-effect import: initialises i18next BEFORE any component renders so
 // useTranslation() always resolves against a live instance. Must come
@@ -18,6 +19,9 @@ import './components/velxio-components/Bmp280Element';
 import './components/velxio-components/EPaperElement';
 import App from './App.tsx';
 
+// Configure monaco-editor for offline use via local static assets
+loader.config({ paths: { vs: '/monaco/vs' } });
+
 createRoot(document.getElementById('root')!).render(<App />);
 
 // Optional pro overlay. The `@pro` import resolves to a no-op stub in the