feat: create ErrorBoundary component with error handling UI and reload functionality

Author: Shreyanshi210205

frontend/src/App.tsx

@@ -8,10 +8,12 @@ import SignUp from "./pages/Signup.js";
 import SignIn from "./pages/Signin.js";
 import OAuthSuccess from "./pages/OAuthSuccess.js";
 import RoomActions from "./pages/RoomActions.js";
+import ErrorBoundary from "./components/ErrorBoundary.js";
 import "./index.css"
 const queryClient = new QueryClient();
 
 const App = () => (
+  <ErrorBoundary>
   <QueryClientProvider client={queryClient}>
     <TooltipProvider>
       <Toaster />
@@ -27,6 +29,7 @@ const App = () => (
       </BrowserRouter>
     </TooltipProvider>
   </QueryClientProvider>
+      </ErrorBoundary>
 );
 
 export default App;

frontend/src/components/ErrorBoundary.tsx

@@ -0,0 +1,75 @@
+import React, { Component, ReactNode } from "react";
+import { AlertTriangle } from "lucide-react"; 
+interface Props {
+  children: ReactNode;
+  fallback?: ReactNode;
+}
+
+interface State {
+  hasError: boolean;
+  error?: Error;
+}
+
+class ErrorBoundary extends Component<Props, State> {
+  declare props: Readonly<Props>;
+  state: State = { hasError: false };
+
+  constructor(props: Props) {
+    super(props);
+  }
+    static getDerivedStateFromError(error: Error): State {
+    return { hasError: true, error };
+  }
+ handleReload = () => {
+    window.location.reload();
+  };
+  render() {
+    const { hasError, error } = this.state;
+    const { children, fallback } = this.props;
+
+    if (hasError) {
+      return (
+        fallback ?? (
+          <div className="flex flex-col items-center justify-center min-h-screen bg-gray-50 dark:bg-gray-900 text-gray-800 dark:text-gray-100 p-6 transition-colors">
+            <div className="  p-8 max-w-md text-center ">
+              <div className="flex justify-center mb-4">
+                <div className="bg-red-100 dark:bg-red-900/30 p-3 rounded-full">
+                  <AlertTriangle className="text-red-600 dark:text-red-400 w-8 h-8" />
+                </div>
+              </div>
+
+              <h2 className="text-2xl font-semibold mb-2">
+                Oops! Something went wrong
+              </h2>
+              <p className="text-sm text-gray-500 dark:text-gray-400 mb-6">
+                {error?.message ?? "An unexpected error occurred. Please try again."}
+              </p>
+
+              <div className="flex gap-3 justify-center">
+                <button
+                  onClick={this.handleReload}
+                  className="px-5 py-2 bg-blue-600 hover:bg-blue-700 text-white rounded-lg transition font-medium shadow-sm"
+                >
+                  Reload Page
+                </button>
+                <button
+                  onClick={() => this.setState({ hasError: false, error: undefined })}
+                  className="px-5 py-2 bg-gray-200 hover:bg-gray-300 dark:bg-gray-700 dark:hover:bg-gray-600 text-gray-700 dark:text-gray-200 rounded-lg transition font-medium"
+                >
+                  Dismiss
+                </button>
+              </div>
+            </div>
+
+            <p className="mt-6 text-xs text-gray-400">
+              If the issue persists, please contact support.
+            </p>
+          </div>
+        )
+      );
+    }
+
+    return children;
+  }
+}
+export default ErrorBoundary;