Revert "fix(#112): remove dead admin breadcrumb code, add logout aria-label"

This reverts commit d5028193c0.

ui/src/components/LayoutShell.tsx

@@ -203,6 +203,23 @@ function LayoutContent() {
 
   const isAdminPage = location.pathname.startsWith('/admin');
   const breadcrumb = useMemo(() => {
+    if (isAdminPage) {
+      const LABELS: Record<string, string> = {
+        admin: 'Admin',
+        rbac: 'Users & Roles',
+        audit: 'Audit Log',
+        oidc: 'OIDC',
+        database: 'Database',
+        clickhouse: 'ClickHouse',
+        appconfig: 'App Config',
+      };
+      const parts = location.pathname.split('/').filter(Boolean);
+      return parts.map((part, i) => ({
+        label: LABELS[part] ?? part,
+        ...(i < parts.length - 1 ? { href: '/' + parts.slice(0, i + 1).join('/') } : {}),
+      }));
+    }
+    // Scope trail as breadcrumb items
     const items: { label: string; href?: string }[] = [
       { label: 'All Applications', href: `/${scope.tab}` },
     ];
@@ -217,7 +234,7 @@ function LayoutContent() {
       delete items[items.length - 1].href;
     }
     return items;
-  }, [scope.tab, scope.appId, scope.routeId]);
+  }, [location.pathname, isAdminPage, scope.tab, scope.appId, scope.routeId]);
 
   const handleLogout = useCallback(() => {
     logout();

ui/src/pages/Admin/AdminLayout.tsx

@@ -34,7 +34,7 @@ export default function AdminLayout() {
         <span className={styles.title}>Admin</span>
         <div className={styles.userSection}>
           <span className={styles.username}>{username}</span>
-          <button className={styles.logoutBtn} onClick={handleLogout} aria-label="Log out">
+          <button className={styles.logoutBtn} onClick={handleLogout}>
             <LogOut size={14} />
           </button>
         </div>