fix(email): hardcode admin dashboard URL and open in new tab

- Replace dynamic admin_dashboard_url construction with hardcoded production URL (https://attunehearttherapy.com/admin/dashboard)
- Add target="_blank" to admin notification email button to open dashboard in new tab
- Improves user experience by preventing email client navigation disruption

meetings/email_service.py

@@ -12,7 +12,7 @@ class EmailService:
             'appointment': appointment,
             'preferred_dates': appointment.get_preferred_dates_display(),
             'preferred_times': appointment.get_preferred_time_slots_display(),
-            'admin_dashboard_url': f"{settings.FRONTEND_URL}/admin/appointments" if hasattr(settings, 'FRONTEND_URL') else '/admin/'
+            'admin_dashboard_url': "https://attunehearttherapy.com/admin/dashboard"
         }
         
         html_message = render_to_string('emails/admin_notification.html', context)

templates/emails/admin_notification.html

@@ -271,7 +271,7 @@
 
         <!-- Action Button -->
         <div class="action-section">
-          <a href="{{ admin_dashboard_url }}" class="button">
+          <a href="{{ admin_dashboard_url }}" target="_blank" class="button">
             Review Appointment Request
           </a>
         </div>