Initial commit

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/App.tsx

@@ -0,0 +1,22 @@
+import { createBrowserRouter, RouterProvider } from 'react-router-dom';
+import { PageShell } from './components/layout/PageShell';
+import { ExercisesPage } from './pages/ExercisesPage';
+import { SetsPage } from './pages/SetsPage';
+import { TrainingPage } from './pages/TrainingPage';
+import { HistoryPage } from './pages/HistoryPage';
+
+const router = createBrowserRouter([
+  {
+    element: <PageShell />,
+    children: [
+      { path: '/', element: <ExercisesPage /> },
+      { path: '/sets', element: <SetsPage /> },
+      { path: '/training', element: <TrainingPage /> },
+      { path: '/history', element: <HistoryPage /> },
+    ],
+  },
+]);
+
+export function App() {
+  return <RouterProvider router={router} />;
+}