Fix stuttering in chapter view keyboard navigation

Changed scrollIntoView behavior from 'smooth' to 'auto' to prevent overlapping scroll animations when holding down arrow keys. This eliminates stuttering and makes rapid navigation smooth.

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

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

kjvstudy_org/templates/chapter.html

@@ -462,7 +462,7 @@ document.addEventListener('DOMContentLoaded', function() {
         selectedVerseIndex = -1;
         actionButtons[selectedActionIndex].classList.add('selected');
         actionButtons[selectedActionIndex].scrollIntoView({
-            behavior: 'smooth',
+            behavior: 'auto',
             block: 'center'
         });
     }
@@ -478,9 +478,9 @@ document.addEventListener('DOMContentLoaded', function() {
         // Add selection to new verse
         verses[selectedVerseIndex].classList.add('selected');
 
-        // Scroll into view
+        // Scroll into view with instant behavior to prevent stuttering when holding down keys
         verses[selectedVerseIndex].scrollIntoView({
-            behavior: 'smooth',
+            behavior: 'auto',
             block: 'center'
         });
     }