fix([2fd88f42]): add react error boundary to debug blank page

heatmap-tool/frontend/src/App.tsx

@@ -4,6 +4,7 @@ import './App.css';
 import FileUpload from './components/FileUpload';
 import FilterPanel from './components/FilterPanel';
 import MapDisplay from './components/MapDisplay';
+import ErrorBoundary from './components/ErrorBoundary';
 
 // Define types for our state
 export interface FilterOptions {
@@ -52,6 +53,7 @@ function App() {
   };
 
   return (
+    <ErrorBoundary>
         <div className="App">
         <header className="App-header">
             <h1>German PLZ Heatmap Tool</h1>
@@ -76,6 +78,7 @@ function App() {
             </div>
         </main>
         </div>
+    </ErrorBoundary>
   );
 }