feat(web): soft-redirect to login on 401 via a navigate bridge (#48)

web/src/shell/navigation-bridge.tsx

@@ -0,0 +1,16 @@
+import { useEffect } from "react";
+import { useNavigate } from "react-router-dom";
+
+import { setNavigate } from "../api/auth-redirect";
+
+/** Bridges React Router's navigate to the non-React 401 handler. Renders nothing. */
+export function NavigationBridge() {
+  const navigate = useNavigate();
+
+  useEffect(() => {
+    setNavigate(navigate);
+    return () => setNavigate(null);
+  }, [navigate]);
+
+  return null;
+}