test(frontend): add Storybook coverage for WorkspaceNav

frontend/src/App.test.tsx

@@ -41,6 +41,9 @@ describe("App, unauthenticated", () => {
         state: expect.objectContaining({ returnUrl: expect.stringMatching(/^\//) }),
       }),
     );
+    // Persisted as a fallback in case the OIDC state round-trip is dropped
+    // (see oidcReturnUrl.ts's restoreOidcReturnUrl, consumed in main.tsx).
+    expect(window.sessionStorage.getItem("lineageweave.oidc.returnUrl")).toMatch(/^\//);
   });
 });
 

frontend/src/App.tsx

@@ -4610,7 +4610,8 @@ export default function App({ showLabPanels = false }: { showLabPanels?: boolean
             </div>
             <div className="login-controls">
               <button className="btn-primary" onClick={() => {
-                const returnUrl = window.location.pathname + window.location.search;
+                const returnUrl = returnUrlFromLocation();
+                rememberOidcReturnUrl(returnUrl);
                 void auth.signinRedirect({ state: { returnUrl } });
               }}>
                 {t("Log in")}
@@ -4620,7 +4621,6 @@ export default function App({ showLabPanels = false }: { showLabPanels?: boolean
               <small>Enterprise SSO Authentication</small>
             </div>
           </div>
-          {destination === "admin" ? <AdminPanel currentBrandName={brandName} onBrandNameChange={setBrandName} accessToken={accessToken} /> : null}
       </main>
         <footer className="app-footer" role="contentinfo">
           <div className="app-footer-title">

frontend/src/components/BuyerNav.stories.tsx

@@ -0,0 +1,34 @@
+import type { Meta, StoryObj } from "@storybook/react-vite";
+import { BuyerNav } from "./BuyerNav";
+
+const meta = {
+  title: "Navigation/BuyerNav",
+  component: BuyerNav,
+  args: {
+    destination: "board",
+    onChange: () => undefined,
+  },
+} satisfies Meta<typeof BuyerNav>;
+
+export default meta;
+
+type Story = StoryObj<typeof meta>;
+
+export const Board: Story = {};
+
+export const AskAgent: Story = {
+  args: { destination: "ask" },
+};
+
+export const Admin: Story = {
+  args: { destination: "admin" },
+};
+
+// Edge case: an extra tools slot (e.g. a settings or logout control) rendered
+// alongside the nav items.
+export const WithTools: Story = {
+  args: {
+    destination: "customers",
+    tools: <button type="button">Sign out</button>,
+  },
+};