feat: add account settings route and user menu dropdown

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

ui/src/components/Layout.tsx

@@ -55,6 +55,14 @@ export function Layout() {
     return { label };
   });
 
+  const userMenuItems = [
+    {
+      label: 'Account Settings',
+      icon: <Settings size={14} />,
+      onClick: () => navigate('/settings/account'),
+    },
+  ];
+
   const sidebar = (
     <Sidebar collapsed={false} onCollapseToggle={() => {}}>
       <Sidebar.Header
@@ -249,6 +257,7 @@ export function Layout() {
       <TopBar
         breadcrumb={breadcrumb}
         user={username ? { name: username } : undefined}
+        userMenuItems={userMenuItems}
         onLogout={logout}
       />
       <Outlet />

ui/src/router.tsx

@@ -27,6 +27,7 @@ import { TeamPage } from './pages/tenant/TeamPage';
 import { SettingsPage } from './pages/tenant/SettingsPage';
 import { TenantAuditPage } from './pages/tenant/TenantAuditPage';
 import { OnboardingPage } from './pages/OnboardingPage';
+import { AccountSettingsPage } from './pages/AccountSettingsPage';
 
 function LandingRedirect() {
   const scopes = useScopes();
@@ -135,6 +136,9 @@ export function AppRouter() {
             <Route path="/tenant/audit" element={<TenantAuditPage />} />
             <Route path="/tenant/settings" element={<SettingsPage />} />
 
+            {/* Account settings — accessible to any authenticated user */}
+            <Route path="settings/account" element={<AccountSettingsPage />} />
+
             {/* Default redirect — vendor goes to /vendor/tenants, customer to /tenant */}
             <Route index element={<LandingRedirect />} />
           </Route>