feat(web): object detail + two-pane page + app routing

Implements the navigable SPA shell: object detail pane showing
inventory-minimum fields, flexible fields (via Record<string,unknown>
cast) and visibility badge; ObjectsPage two-pane layout; BrowserRouter
wired through RequireAuth+AppShell; QueryClient provided in main.tsx.
Consolidates ObjectList NavLink to use isActive function form, removing
manual useParams highlight.

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

web/src/main.tsx

@@ -1,11 +1,19 @@
-import "./index.css";
-import "./i18n";
 import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+
 import { App } from "./app";
+import "./index.css";
+import "./i18n";
+
+const queryClient = new QueryClient({
+  defaultOptions: { queries: { retry: false, refetchOnWindowFocus: false } },
+});
 
 createRoot(document.getElementById("root")!).render(
   <StrictMode>
-    <App />
+    <QueryClientProvider client={queryClient}>
+      <App />
+    </QueryClientProvider>
   </StrictMode>,
 );