[web] Add Global Error Boundary with Retry Mechanism

.Jules/changelog.md

@@ -7,6 +7,8 @@
 ## [Unreleased]
 
 ### Added
+- Global `ErrorBoundary` component (`web/components/ErrorBoundary.tsx`) wrapping the web application to catch render errors.
+- Dual-theme supported Error UI with "Try Again" (reset boundary) and "Reload Page" options.
 - Inline form validation in Auth page with real-time feedback and proper ARIA accessibility support (`aria-invalid`, `aria-describedby`, `role="alert"`).
 - Dashboard skeleton loading state (`DashboardSkeleton`) to improve perceived performance during data fetch.
 - Comprehensive `EmptyState` component for Groups and Friends pages to better guide new users.

.Jules/todo.md

@@ -34,12 +34,10 @@
   - Impact: Guides new users, makes app feel polished
   - Size: ~70 lines
 
-- [ ] **[ux]** Error boundary with retry for API failures
-  - Files: Create `web/components/ErrorBoundary.tsx`, wrap app
-  - Context: Catch errors gracefully with retry button
-  - Impact: App doesn't crash, users can recover
-  - Size: ~60 lines
-  - Added: 2026-01-01
+- [x] **[ux]** Error boundary with retry for API failures
+  - Completed: 2026-01-14
+  - Files modified: `web/components/ErrorBoundary.tsx`, `web/App.tsx`
+  - Impact: Catches global and render errors, presenting a theme-aware UI with retry/reload options instead of a white screen.
 
 ### Mobile
 

web/App.tsx

@@ -6,6 +6,7 @@ import { AuthProvider, useAuth } from './contexts/AuthContext';
 import { ThemeProvider } from './contexts/ThemeContext';
 import { ToastProvider } from './contexts/ToastContext';
 import { ToastContainer } from './components/ui/Toast';
+import { ErrorBoundary } from './components/ErrorBoundary';
 import { Auth } from './pages/Auth';
 import { Dashboard } from './pages/Dashboard';
 import { Friends } from './pages/Friends';
@@ -51,8 +52,10 @@ const App = () => {
       <ToastProvider>
         <AuthProvider>
           <HashRouter>
+            <ErrorBoundary>
               <AppRoutes />
-              <ToastContainer />
+            </ErrorBoundary>
+            <ToastContainer />
           </HashRouter>
         </AuthProvider>
       </ToastProvider>

web/components/ErrorBoundary.tsx

@@ -0,0 +1,94 @@
+import React, { Component, ErrorInfo, ReactNode } from 'react';
+import { useTheme } from '../contexts/ThemeContext';
+import { THEMES } from '../constants';
+import { Button } from './ui/Button';
+import { Card } from './ui/Card';
+import { AlertTriangle, RefreshCw, Home } from 'lucide-react';
+
+interface Props {
+  children: ReactNode;
+}
+
+interface State {
+  hasError: boolean;
+  error: Error | null;
+}
+
+const ErrorFallback = ({ error, resetErrorBoundary }: { error: Error | null, resetErrorBoundary: () => void }) => {
+  const { style } = useTheme();
+  const isNeo = style === THEMES.NEOBRUTALISM;
+
+  return (
+    <div className="min-h-[60vh] flex items-center justify-center p-4">
+      <Card className="max-w-md w-full text-center">
+        <div className={`flex justify-center mb-6 ${isNeo ? 'text-black' : 'text-red-400'}`}>
+          <AlertTriangle size={64} strokeWidth={isNeo ? 2.5 : 1.5} />
+        </div>
+
+        <h2 className={`text-2xl font-bold mb-4 ${isNeo ? 'uppercase font-mono' : ''}`}>
+          Something went wrong
+        </h2>
+
+        <div className={`p-4 mb-6 rounded text-sm text-left overflow-auto max-h-32 ${
+          isNeo
+            ? 'bg-red-100 border-2 border-black text-black font-mono'
+            : 'bg-red-500/10 border border-red-500/20 text-red-200'
+        }`}>
+          {error?.message || "An unexpected error occurred."}
+        </div>
+
+        <div className="flex flex-col gap-3 sm:flex-row sm:justify-center">
+          <Button
+            onClick={resetErrorBoundary}
+            variant="primary"
+            className="w-full sm:w-auto"
+          >
+            <RefreshCw size={18} />
+            Try Again
+          </Button>
+
+          <Button
+            onClick={() => window.location.reload()}
+            variant="ghost"
+            className="w-full sm:w-auto"
+          >
+            <Home size={18} />
+            Reload Page
+          </Button>
+        </div>
+      </Card>
+    </div>
+  );
+};
+
+export class ErrorBoundary extends Component<Props, State> {
+  constructor(props: Props) {
+    super(props);
+    this.state = { hasError: false, error: null };
+  }
+
+  static getDerivedStateFromError(error: Error): State {
+    return { hasError: true, error };
+  }
+
+  componentDidCatch(error: Error, errorInfo: ErrorInfo) {
+    console.error("Uncaught error:", error, errorInfo);
+  }
+
+  resetErrorBoundary = () => {
+    this.setState({ hasError: false, error: null });
+  };
+
+  render() {
+    if (this.state.hasError) {
+      return (
+        <ErrorFallback
+          error={this.state.error}
+          resetErrorBoundary={this.resetErrorBoundary}
+        />
+      );
+    }
+
+    return this.props.children;
+  }
+}