fix: Correct Jinja2 template syntax error (missing endif removal)

Error: 'Encountered unknown tag else' - endif was closing the if block too early

Fix: Removed extra {% endif %} before {% else %}
- Line 232: Removed incorrect closing tag
- The {% else %} at line 234 is part of the hierarchical/simple mode conditional
- Proper structure: if hierarchical ... else simple ... endif

Tests:
- Template syntax validates ✓
- Search page loads ✓
- Hierarchical mode works ✓

generations/library_rag/templates/search.html

@@ -229,7 +229,6 @@
                         </div>
                     {% endfor %}
                 </div>
-            {% endif %}
 
             <!-- Simple display (original) -->
             {% else %}