Add catch-all route to redirect unknown paths to login

Handles legacy URLs like /index.html?autoconnect=false that old cached
safetoken pages may redirect to.

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

Author: johnebgood

react-app/src/App.tsx

@@ -34,6 +34,7 @@ const router = createHashRouter([
   },
   { path: '/cct', element: <CCTOverlay /> },
   { path: '/viewer', element: <ViewerPage /> },
+  { path: '*', element: <Navigate to="/login" replace /> },
 ]);
 
 export default function App() {