Initial commit

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

frontend/src/components/layout/PageShell.tsx

@@ -0,0 +1,18 @@
+import { Outlet } from 'react-router-dom';
+import { BottomNav, Sidebar } from './BottomNav';
+import { ToastContainer } from './Toast';
+
+export function PageShell() {
+  return (
+    <div className="flex min-h-screen">
+      <Sidebar />
+      <main className="flex-1 pb-20 md:pb-0">
+        <div className="max-w-2xl mx-auto px-4 py-6">
+          <Outlet />
+        </div>
+      </main>
+      <BottomNav />
+      <ToastContainer />
+    </div>
+  );
+}