feat(nav): add responsive mobile dropdown menu with avatar and counters

- Hide desktop items on small screens, add Menu/X toggle
- Include Matches badge, History, Profile, and Logout
- Keep real-time pending matches counter

frontend/src/components/layout/Navbar.jsx

@@ -1,6 +1,6 @@
 import { Link, useNavigate } from 'react-router-dom';
 import { useAuth } from '../../contexts/AuthContext';
-import { Video, LogOut, User, History, Users } from 'lucide-react';
+import { Video, LogOut, User, History, Users, Menu, X } from 'lucide-react';
 import Avatar from '../common/Avatar';
 import { useState, useEffect } from 'react';
 import { matchesAPI } from '../../services/api';
@@ -10,6 +10,7 @@ const Navbar = () => {
   const { user, logout } = useAuth();
   const navigate = useNavigate();
   const [pendingMatchesCount, setPendingMatchesCount] = useState(0);
+  const [menuOpen, setMenuOpen] = useState(false);
 
   const handleLogout = () => {
     logout();
@@ -68,8 +69,8 @@ const Navbar = () => {
               <span className="text-xl font-bold text-gray-900">spotlight.cam</span>
             </Link>
           </div>
-
+          {/* Desktop menu */}
-          <div className="flex items-center space-x-4">
+          <div className="hidden md:flex items-center space-x-4">
             <Link
               to="/matches"
               className="flex items-center space-x-1 px-3 py-2 rounded-md text-sm font-medium text-gray-700 hover:text-primary-600 hover:bg-gray-100 relative"
@@ -112,8 +113,70 @@ const Navbar = () => {
               <span>Logout</span>
             </button>
           </div>
+
+          {/* Mobile menu button */}
+          <div className="flex md:hidden items-center">
+            <button
+              onClick={() => setMenuOpen((o) => !o)}
+              aria-label="Open menu"
+              className="p-2 rounded-md text-gray-700 hover:bg-gray-100"
+            >
+              {menuOpen ? <X className="w-6 h-6" /> : <Menu className="w-6 h-6" />}
+            </button>
           </div>
         </div>
+      </div>
+
+      {/* Mobile dropdown */}
+      {menuOpen && (
+        <div className="md:hidden border-t bg-white shadow-sm">
+          <div className="px-4 py-3 flex items-center space-x-3">
+            <Avatar src={user?.avatar} username={user.username} size={32} />
+            <div className="flex-1">
+              <p className="text-sm font-medium text-gray-900">{user.username}</p>
+            </div>
+          </div>
+          <div className="px-2 pb-2 space-y-1">
+            <Link
+              to="/matches"
+              onClick={() => setMenuOpen(false)}
+              className="flex items-center justify-between px-3 py-2 rounded-md text-sm font-medium text-gray-700 hover:bg-gray-100"
+            >
+              <span className="flex items-center gap-2">
+                <Users className="w-4 h-4" /> Matches
+              </span>
+              {pendingMatchesCount > 0 && (
+                <span className="ml-2 bg-red-500 text-white text-xs rounded-full h-5 px-2 flex items-center justify-center font-semibold">
+                  {pendingMatchesCount}
+                </span>
+              )}
+            </Link>
+            <Link
+              to="/history"
+              onClick={() => setMenuOpen(false)}
+              className="flex items-center gap-2 px-3 py-2 rounded-md text-sm font-medium text-gray-700 hover:bg-gray-100"
+            >
+              <History className="w-4 h-4" /> History
+            </Link>
+            <Link
+              to="/profile"
+              onClick={() => setMenuOpen(false)}
+              className="flex items-center gap-2 px-3 py-2 rounded-md text-sm font-medium text-gray-700 hover:bg-gray-100"
+            >
+              <User className="w-4 h-4" /> Profile
+            </Link>
+            <button
+              onClick={() => {
+                setMenuOpen(false);
+                handleLogout();
+              }}
+              className="w-full flex items-center gap-2 px-3 py-2 rounded-md text-sm font-medium text-red-600 hover:bg-red-50"
+            >
+              <LogOut className="w-4 h-4" /> Logout
+            </button>
+          </div>
+        </div>
+      )}
     </nav>
   );
 };