L16: Add Sign-Out Button

Shared computers: Next user shouldn't access your account
Public WiFi: Close session when leaving
Work computers: Don't leave account open
Privacy: End session when done

Switch accounts: Sign out of one, into another
Testing: Developers need to test both states
Troubleshooting: "Have you tried signing out and back in?"
Peace of mind: User controls their session

import { Link, useNavigate } from 'react-router-dom';
import { useAuth } from '@/contexts/AuthContext';

function Navbar() {
  const { user, signOut } = useAuth();
  const navigate = useNavigate();

  const handleSignOut = async () => {
    await signOut();
    navigate('/');
  };

  return (
    <nav className="navbar">
      {/* Brand */}
      <Link to="/" className="nav-brand">
        🏖️ Holidaze
      </Link>

      {/* Navigation Links */}
      <div className="nav-links">
        <Link to="/">Home</Link>
        <Link to="/venues">Venues</Link>

        {user ? (
          <>
            {/* Authenticated links */}
            <Link to="/bookings">My Bookings</Link>
            <Link to="/favorites">Favorites</Link>
            <Link to="/venues/create">List Venue</Link>

            {/* User dropdown */}
            <div className="nav-user-menu">
              <button className="nav-user-button">
                <img 
                  src={user.avatar?.url || '/default-avatar.png'} 
                  alt={user.name}
                  className="nav-user-avatar"
                />
                <span className="nav-user-name">{user.name}</span>
                <span className="nav-user-icon">▼</span>
              </button>

              {/* Dropdown menu */}
              <div className="nav-user-dropdown">
                <Link to="/profile" className="dropdown-item">
                  <span className="dropdown-icon">👤</span>
                  Profile
                </Link>
                <Link to="/settings" className="dropdown-item">
                  <span className="dropdown-icon">⚙️</span>
                  Settings
                </Link>
                <Link to="/bookings" className="dropdown-item">
                  <span className="dropdown-icon">📅</span>
                  My Bookings
                </Link>
                <hr className="dropdown-divider" />
                <button 
                  onClick={handleSignOut}
                  className="dropdown-item dropdown-item-danger"
                >
                  <span className="dropdown-icon">🚪</span>
                  Sign Out
                </button>
              </div>
            </div>
          </>
        ) : (
          <>
            {/* Guest links */}
            <Link to="/sign-in" className="nav-link-secondary">
              Sign In
            </Link>
            <Link to="/sign-up" className="nav-link-primary">
              Sign Up
            </Link>
          </>
        )}
      </div>
    </nav>
  );
}

export default Navbar;

/* User Menu */
.nav-user-menu {
  position: relative;
}

.nav-user-button {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: transparent;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.nav-user-button:hover {
  background: #f9fafb;
  border-color: #d1d5db;
}

.nav-user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
}

.nav-user-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: #1f2937;
}

.nav-user-icon {
  font-size: 0.75rem;
  color: #6b7280;
  transition: transform 0.2s;
}

.nav-user-menu:hover .nav-user-icon {
  transform: rotate(180deg);
}

/* Dropdown */
.nav-user-dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 200px;
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.2s;
  z-index: 1000;
}

.nav-user-menu:hover .nav-user-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Dropdown Items */
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  color: #374151;
  text-decoration: none;
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
  text-align: left;
}

.dropdown-item:hover {
  background: #f3f4f6;
}

.dropdown-icon {
  font-size: 1.125rem;
}

.dropdown-divider {
  margin: 0.5rem 0;
  border: none;
  border-top: 1px solid #e5e7eb;
}

.dropdown-item-danger {
  color: #dc2626;
}

.dropdown-item-danger:hover {
  background: #fef2f2;
  color: #b91c1c;
}

/* Mobile responsive */
@media (max-width: 768px) {
  .nav-user-name {
    display: none;
  }

  .nav-user-button {
    padding: 0.5rem;
  }
}

import { createContext, useContext, useState, useEffect } from 'react';
import { useNavigate } from 'react-router-dom';
import api from '@/lib/api';
import { tokenStore } from '@/lib/tokenStore';

// ... (previous code)

export const AuthProvider = ({ children }) => {
  const [user, setUser] = useState(null);
  const [token, setToken] = useState(null);
  const [isLoading, setIsLoading] = useState(true);
  const navigate = useNavigate();

  // ... (previous useEffects and signIn)

  const signOut = async () => {
    try {
      // Call logout endpoint (clears refresh token cookie)
      await api.post('/auth/logout');
    } catch (error) {
      // Even if API call fails, sign out locally
      console.error('Logout error:', error);
    } finally {
      // Clear local state
      setUser(null);
      setToken(null);
      
      // Clear token store
      tokenStore.clearToken();
      
      // Redirect to home
      navigate('/', { replace: true });
    }
  };

  const value = { user, token, isLoading, signIn, signOut };
  return <AuthContext.Provider value={value}>{children}</AuthContext.Provider>;
};