feat: add error boundary to prevent full app crashes

src/App.tsx

@@ -5,9 +5,11 @@ import { AuthProvider } from './contexts/AuthContext';
 import { TLDrawProvider } from './contexts/TLDrawContext';
 import { UserProvider } from './contexts/UserContext';
 import AppRoutes from './AppRoutes';
+import { ErrorBoundary } from './components/ErrorBoundary';
 import React from 'react';
 
 const App = React.memo(() => (
+  <ErrorBoundary>
     <BrowserRouter future={{ v7_startTransition: true, v7_relativeSplatPath: true }}>
       <ThemeProvider theme={theme}>
         <AuthProvider>
@@ -19,6 +21,7 @@ const App = React.memo(() => (
         </AuthProvider>
       </ThemeProvider>
     </BrowserRouter>
+  </ErrorBoundary>
 ));
 
 App.displayName = import.meta.env.VITE_APP_NAME;

src/components/ErrorBoundary.tsx

@@ -0,0 +1,84 @@
+import React, { Component, ErrorInfo, ReactNode } from 'react';
+
+interface Props {
+  children: ReactNode;
+  fallback?: ReactNode;
+}
+
+interface State {
+  hasError: boolean;
+  error: Error | null;
+}
+
+export class ErrorBoundary extends Component<Props, State> {
+  public state: State = {
+    hasError: false,
+    error: null,
+  };
+
+  public static getDerivedStateFromError(error: Error): State {
+    return { hasError: true, error };
+  }
+
+  public componentDidCatch(error: Error, errorInfo: ErrorInfo) {
+    console.error('Uncaught error:', error, errorInfo);
+  }
+
+  public render() {
+    if (this.state.hasError) {
+      if (this.props.fallback) {
+        return this.props.fallback;
+      }
+      return (
+        <div style={{
+          display: 'flex',
+          flexDirection: 'column',
+          alignItems: 'center',
+          justifyContent: 'center',
+          minHeight: '100vh',
+          fontFamily: 'system-ui, -apple-system, sans-serif',
+          padding: '2rem',
+          textAlign: 'center',
+        }}>
+          <h1 style={{ color: '#dc2626', marginBottom: '1rem' }}>Something went wrong</h1>
+          <p style={{ color: '#6b7280', marginBottom: '1.5rem' }}>
+            {this.state.error?.message || 'An unexpected error occurred'}
+          </p>
+          <button
+            onClick={() => {
+              this.setState({ hasError: false, error: null });
+              window.location.reload();
+            }}
+            style={{
+              padding: '0.75rem 1.5rem',
+              backgroundColor: '#3b82f6',
+              color: 'white',
+              border: 'none',
+              borderRadius: '0.5rem',
+              cursor: 'pointer',
+              fontSize: '1rem',
+            }}
+          >
+            Reload Application
+          </button>
+          {import.meta.env.DEV && (
+            <details style={{ marginTop: '2rem', textAlign: 'left', maxWidth: '600px' }}>
+              <summary style={{ cursor: 'pointer', color: '#6b7280' }}>Error Details</summary>
+              <pre style={{
+                backgroundColor: '#f3f4f6',
+                padding: '1rem',
+                borderRadius: '0.5rem',
+                overflow: 'auto',
+                fontSize: '0.875rem',
+              }}>
+                {this.state.error?.stack}
+              </pre>
+            </details>
+          )}
+        </div>
+      );
+    }
+
+    return this.props.children;
+  }
+}