Fix offline page JS not loading - remove extra_js block

The base.html template doesn't have an extra_js block defined,
so the JavaScript was being silently dropped. Moved the script
tag inside the content block where it will be rendered.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

kjvstudy_org/templates/offline.html

@@ -641,9 +641,7 @@
         <p style="color: var(--text-secondary); font-size: 0.9rem;">Scanning cache...</p>
     </div>
 </details>
-{% endblock %}
 
-{% block extra_js %}
 <script>
 (function() {
     const connectionStatus = document.getElementById('connection-status');