fix: increase search button spacing above chat widget

Move search button from bottom:72px to bottom:130px for better
vertical spacing and alignment with chat widget

Author: neuromechanist

_layouts/default.html

@@ -190,7 +190,7 @@ <h2 class="text-delta">Table of contents</h2>
 
     {% if site.search_enabled != false %}
       {% if site.search.button %}
-        <a href="#" id="search-button" class="search-button" style="bottom: 72px;">
+        <a href="#" id="search-button" class="search-button" style="bottom: 130px;">
           <svg viewBox="0 0 24 24" class="icon"><use xlink:href="#svg-search"></use></svg>
         </a>
       {% endif %}