Add Google OAuth admin login; fix header comment; both auth methods active

admin/includes/header.php

@@ -1,7 +1,7 @@
 <?php
 /**
  * Tom's Java Jive - Admin Header
- * Authentication temporarily disabled
+ * Requires AdminAuth::require() — redirects to login.php
  */
 
 require_once __DIR__ . '/../../includes/auth.php';
@@ -105,10 +105,10 @@ $currentPage = basename($_SERVER['PHP_SELF'], '.php');
                     <a href="/admin/campaigns.php" class="nav-item <?= $currentPage === 'campaigns' ? 'active' : '' ?>">
                         <i class="fas fa-envelope"></i> Email Campaigns
                     </a>
+                    <a href="/admin/email-log.php" class="nav-item <?= $currentPage === 'email-log' ? 'active' : '' ?>"><i class="fas fa-envelope-open-text"></i> Email Log</a>
                 </div>
                 
                 <div class="nav-group">
-                    <span class="nav-group-title">Settings</span>
                     <a href="/admin/settings.php" class="nav-item <?= $currentPage === 'settings' ? 'active' : '' ?>">
                         <i class="fas fa-cog"></i> Store Settings
                     </a>