Expand chronology comparison table by default

Added 'open' attribute to <details> element so the chronology comparison
table is visible by default rather than collapsed. Users can still collapse
it if desired by clicking the summary.

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

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

kjvstudy_org/templates/biblical_timeline.html

@@ -17,7 +17,7 @@
     {% endif %}
 
     {% if chronology_comparison %}
-    <details style="margin-top: 2rem; max-width: 75%;">
+    <details open style="margin-top: 2rem; max-width: 75%;">
         <summary style="cursor: pointer; font-weight: 600; font-size: 1.1rem; padding: 0.5rem 0; user-select: none;">
             Compare Biblical Chronologies
         </summary>