Remove overview border, keep verse borders in topic pages

Removed the border from topic overview sections for a cleaner look,
but kept the left border on verse items for visual hierarchy.

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

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

kjvstudy_org/templates/topic_detail.html

@@ -79,6 +79,8 @@
 
 .verse-item {
     margin: 1rem 0;
+    padding-left: 1.5rem;
+    border-left: 2px solid var(--border-color);
 }
 
 .verse-ref {

kjvstudy_org/templates/topic_pdf.html

@@ -41,8 +41,6 @@
 
         .overview {
             margin-bottom: 0.3in;
-            padding-left: 0.25in;
-            border-left: 3px solid #ddd;
         }
 
         .verse-list {