Add customer registration and deployment updates

frontend/src/layout/AppShell.tsx

@@ -1,13 +1,6 @@
 import { NavLink, Outlet, useLocation, useNavigate } from "react-router-dom";
 import { useSession } from "../lib/session";
 
-const NAV_ITEMS = [
-  { to: "/home", label: "Start" },
-  { to: "/samples/new", label: "Neue Probe" },
-  { to: "/admin", label: "Verwaltung" },
-  { to: "/portal", label: "Portal" },
-];
-
 const PAGE_TITLES: Record<string, string> = {
   "/home": "Startseite",
   "/samples/new": "Neuanlage einer Probe",
@@ -35,6 +28,14 @@ export default function AppShell() {
   const { user, setUser } = useSession();
   const location = useLocation();
   const navigate = useNavigate();
+  const navItems = user?.role === "ADMIN"
+    ? [{ to: "/portal", label: "Benutzerverwaltung" }]
+    : [
+        { to: "/home", label: "Start" },
+        { to: "/samples/new", label: "Neue Probe" },
+        { to: "/admin", label: "Verwaltung" },
+        { to: "/portal", label: "Portal" },
+      ];
 
   return (
     <div className="app-shell">
@@ -44,7 +45,7 @@ export default function AppShell() {
         </div>
 
         <nav className="sidebar__nav">
-          {NAV_ITEMS.map((item) => (
+          {navItems.map((item) => (
             <NavLink
               key={item.to}
               to={item.to}
@@ -78,12 +79,6 @@ export default function AppShell() {
           <div className="topbar__headline">
             <h2>{resolvePageTitle(location.pathname)}</h2>
           </div>
-
-          <div className="topbar__actions">
-            <button type="button" className="accent-button" onClick={() => navigate("/samples/new")}>
-              Neuanlage
-            </button>
-          </div>
         </header>
 
         <main className="content-area">