more stuff to improve robustness

frontend/src/main.tsx

@@ -5,10 +5,30 @@ import './lib/dev-logger';
 // Tauri bridge polyfill: must be imported before App so window.electronAPI is available to all components
 import './lib/tauri-bridge';
 import App from './App';
+import ErrorBoundary from './components/ErrorBoundary';
 import './index.css';
 
+window.addEventListener('error', (e) => {
+  if (e.error) {
+    try {
+      console.error('[GlobalError]', e.error.message, e.error.stack);
+      window.electronAPI?.logError?.(e.error.message, e.error.stack || '', '');
+    } catch {}
+  }
+});
+
+window.addEventListener('unhandledrejection', (e) => {
+  const reason = e.reason instanceof Error ? e.reason : new Error(String(e.reason));
+  try {
+    console.error('[UnhandledRejection]', reason.message, reason.stack);
+    window.electronAPI?.logError?.(reason.message, reason.stack || '', '');
+  } catch {}
+});
+
 ReactDOM.createRoot(document.getElementById('root')!).render(
   <React.StrictMode>
-    <App />
+    <ErrorBoundary>
+      <App />
+    </ErrorBoundary>
   </React.StrictMode>,
 );