Fix table borders, single team nav link, remove dashboard stats

- Use explicit border color (#e2e8f0) for table cell borders
- Navbar shows 'Team' (singular) linking directly to team dashboard when user has only 1 team
- Navbar shows 'Teams' (plural) linking to teams list when user has multiple teams
- Remove project/member counts from team dashboard header

frontend/src/components/Layout.tsx

@@ -2,6 +2,8 @@ import { ReactNode, useState, useRef, useEffect } from 'react';
 import { Link, NavLink, useLocation, useNavigate } from 'react-router-dom';
 import { useAuth } from '../contexts/AuthContext';
 import { GlobalSearch } from './GlobalSearch';
+import { listTeams } from '../api';
+import { TeamDetail } from '../types';
 import './Layout.css';
 
 interface LayoutProps {
@@ -13,8 +15,22 @@ function Layout({ children }: LayoutProps) {
   const navigate = useNavigate();
   const { user, loading, logout } = useAuth();
   const [showUserMenu, setShowUserMenu] = useState(false);
+  const [userTeams, setUserTeams] = useState<TeamDetail[]>([]);
   const menuRef = useRef<HTMLDivElement>(null);
 
+  // Fetch user's teams
+  useEffect(() => {
+    if (user) {
+      listTeams({ limit: 10 }).then(data => {
+        setUserTeams(data.items);
+      }).catch(() => {
+        setUserTeams([]);
+      });
+    } else {
+      setUserTeams([]);
+    }
+  }, [user]);
+
   // Close menu when clicking outside
   useEffect(() => {
     function handleClickOutside(event: MouseEvent) {
@@ -77,15 +93,18 @@ function Layout({ children }: LayoutProps) {
               </svg>
               Dashboard
             </Link>
-            {user && (
-              <Link to="/teams" className={location.pathname.startsWith('/teams') ? 'active' : ''}>
+            {user && userTeams.length > 0 && (
+              <Link
+                to={userTeams.length === 1 ? `/teams/${userTeams[0].slug}` : '/teams'}
+                className={location.pathname.startsWith('/teams') ? 'active' : ''}
+              >
                 <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
                   <path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"/>
                   <circle cx="9" cy="7" r="4"/>
                   <path d="M23 21v-2a4 4 0 0 0-3-3.87"/>
                   <path d="M16 3.13a4 4 0 0 1 0 7.75"/>
                 </svg>
-                Teams
+                {userTeams.length === 1 ? 'Team' : 'Teams'}
               </Link>
             )}
             <a href="/docs" className="nav-link-muted">