fix: offset floating search button above chat widget

Search button uses position:fixed via theme CSS. Added inline
bottom:72px to push it above the chat widget button.

Author: neuromechanist

_layouts/default.html

@@ -189,6 +189,12 @@ <h2 class="text-delta">Table of contents</h2>
     </div>
 
     {% if site.search_enabled != false %}
+      {% if site.search.button %}
+        <a href="#" id="search-button" class="search-button" style="bottom: 72px;">
+          <svg viewBox="0 0 24 24" class="icon"><use xlink:href="#svg-search"></use></svg>
+        </a>
+      {% endif %}
+
       <div class="search-overlay"></div>
     {% endif %}
   </div>