autofocus search input on page load

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Co-Authored-By: Claude <[e-mail]>

static/index.html

···
                     id="searchInput"
                     placeholder="describe the bufo you seek..."
                     autocomplete="off"
+                    autofocus
                 >
                 <button id="searchButton">search</button>
             </div>
···
                 searchInput.value = query;
                 search(false); // don't update URL since we're already loading from it
             }
+
+            // ensure focus on the search input
+            searchInput.focus();
         });
 
         // handle sample query button clicks