Make chapter numbers bigger on mobile book view

Increased from 1.4rem to 2.2rem for better tap targets and readability.

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

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

kjvstudy_org/templates/book.html

@@ -152,7 +152,8 @@ section ul li strong {
 /* Mobile optimizations */
 @media (max-width: 768px) {
     .chapters-section h2 + p a {
-        font-size: 1.4rem;
+        font-size: 2.2rem;
+        line-height: 1.6;
     }
 
     .book-meta {
@@ -173,12 +174,6 @@ section ul li strong {
         display: none;
     }
 }
-
-@media (max-width: 480px) {
-    .chapters-section h2 + p a {
-        font-size: 1.2rem;
-    }
-}
 </style>
 <script>
 document.addEventListener('DOMContentLoaded', function() {