feat(frontend): add React UI — procurement office, wizard, suppliers, inventory panel (dash port), role-based login

frontend/src/main.tsx

@@ -0,0 +1,27 @@
+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+import { BrowserRouter } from "react-router-dom";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { Toaster } from "sonner";
+import App from "./App";
+import "./styles/globals.css";
+
+const queryClient = new QueryClient({
+  defaultOptions: {
+    queries: {
+      retry: false,
+      refetchOnWindowFocus: false,
+    },
+  },
+});
+
+createRoot(document.getElementById("root")!).render(
+  <StrictMode>
+    <QueryClientProvider client={queryClient}>
+      <BrowserRouter>
+        <App />
+      </BrowserRouter>
+      <Toaster position="top-center" richColors closeButton />
+    </QueryClientProvider>
+  </StrictMode>,
+);