debug: Add safe App version with lazy loading and error boundaries

src/App.safe.tsx

@@ -0,0 +1,139 @@
+import { useState, Suspense, lazy } from 'react';
+import './App.css';
+
+// Lazy load components to identify which one is breaking
+const StudentDashboard = lazy(() => import('./pages/StudentDashboard'));
+const ScoreFollowing = lazy(() => import('./pages/ScoreFollowing'));
+
+type ViewType = 'dashboard' | 'practice' | 'learn' | 'score-following';
+
+function LoadingFallback({ message }: { message: string }) {
+  return (
+    <div
+      style={{
+        display: 'flex',
+        alignItems: 'center',
+        justifyContent: 'center',
+        minHeight: '50vh',
+        fontSize: '1.5rem',
+        color: '#667eea',
+      }}
+    >
+      <div style={{ textAlign: 'center' }}>
+        <div style={{ fontSize: '3rem', marginBottom: '1rem' }}>⏳</div>
+        <div>{message}</div>
+      </div>
+    </div>
+  );
+}
+
+function ErrorBoundary({ children }: { children: React.ReactNode }) {
+  const [hasError, setHasError] = useState(false);
+  const [error, setError] = useState<Error | null>(null);
+
+  if (hasError) {
+    return (
+      <div
+        style={{
+          padding: '2rem',
+          margin: '2rem',
+          background: '#fee',
+          border: '2px solid #f00',
+          borderRadius: '8px',
+        }}
+      >
+        <h2>❌ Erro ao carregar componente</h2>
+        <pre
+          style={{
+            background: '#fff',
+            padding: '1rem',
+            borderRadius: '4px',
+            overflow: 'auto',
+          }}
+        >
+          {error?.toString()}
+          {'\n\n'}
+          {error?.stack}
+        </pre>
+        <button
+          onClick={() => {
+            setHasError(false);
+            setError(null);
+            window.location.reload();
+          }}
+          style={{
+            padding: '0.5rem 1rem',
+            marginTop: '1rem',
+            cursor: 'pointer',
+          }}
+        >
+          Recarregar
+        </button>
+      </div>
+    );
+  }
+
+  try {
+    return <>{children}</>;
+  } catch (e) {
+    setHasError(true);
+    setError(e as Error);
+    return null;
+  }
+}
+
+function App() {
+  const [currentView, setCurrentView] = useState<ViewType>('dashboard');
+
+  return (
+    <div className="app">
+      <header className="app-header">
+        <div className="container">
+          <div className="header-content">
+            <div className="logo">
+              <h1>🎹 Piano Tutor</h1>
+              <span className="tagline">Treinamento Inteligente com IA</span>
+            </div>
+            <nav className="main-nav">
+              <button
+                className={`nav-button ${currentView === 'dashboard' ? 'active' : ''}`}
+                onClick={() => setCurrentView('dashboard')}
+              >
+                Dashboard
+              </button>
+              <button
+                className={`nav-button ${currentView === 'score-following' ? 'active' : ''}`}
+                onClick={() => setCurrentView('score-following')}
+              >
+                YouTube → Tutorial
+              </button>
+              <button className="nav-button" disabled>
+                Prática
+              </button>
+              <button className="nav-button" disabled>
+                Aprender
+              </button>
+            </nav>
+          </div>
+        </div>
+      </header>
+
+      <main className="app-main">
+        <ErrorBoundary>
+          <Suspense fallback={<LoadingFallback message="Carregando componente..." />}>
+            {currentView === 'dashboard' && <StudentDashboard />}
+            {currentView === 'score-following' && <ScoreFollowing />}
+          </Suspense>
+        </ErrorBoundary>
+      </main>
+
+      <footer className="app-footer">
+        <div className="container">
+          <p>Piano Tutor v1.0.0 - MVP | Desenvolvido com React + TypeScript + IA</p>
+        </div>
+      </footer>
+    </div>
+  );
+}
+
+export default App;