fix: open advanced search from empty home search

Co-authored-by: rafa <rcalvotorrejon@gmail.com>
Signed-off-by: rafa <rcalvotorrejon@gmail.com>

mu-plugins/fea-homepage.php

@@ -924,6 +924,58 @@ function fea_is_front_page(): bool {
     return $id && in_array($id, fea_front_page_ids(), true);
 }
 
+/** URL de la búsqueda avanzada en el idioma actual, con fallback al español. */
+function fea_home_advanced_search_url(): string {
+    $url = home_url('/buscar/');
+    if (!function_exists('pll_current_language') || !function_exists('pll_get_post')) return $url;
+
+    $lang    = pll_current_language();
+    $default = function_exists('pll_default_language') ? pll_default_language() : 'es';
+    if (!$lang || $lang === $default) return $url;
+
+    $page = get_page_by_path('buscar');
+    if (!$page) return $url;
+
+    $translated_id = pll_get_post($page->ID, $lang);
+    return $translated_id ? get_permalink($translated_id) : $url;
+}
+
+// En desktop, una lupa sin texto abre la búsqueda avanzada en vez de activar la
+// validación nativa del campo requerido del bloque Search de WordPress.
+add_action('wp_footer', function() {
+    if (!fea_is_front_page()) return;
+    $advanced_url = wp_json_encode(fea_home_advanced_search_url());
+    ?>
+    <script>
+    (function() {
+        function configureDesktopSearch() {
+            if (!window.matchMedia('(min-width: 601px)').matches) return;
+
+            document.querySelectorAll('form.wp-block-search, .wp-block-search form').forEach(function(form) {
+                var input = form.querySelector('input[type="search"], input[name="s"]');
+                if (!input || form.dataset.feaEmptySearchReady) return;
+
+                form.dataset.feaEmptySearchReady = 'true';
+                form.noValidate = true;
+                input.removeAttribute('required');
+                form.addEventListener('submit', function(event) {
+                    if (input.value.trim() !== '') return;
+                    event.preventDefault();
+                    window.location.assign(<?php echo $advanced_url; ?>);
+                });
+            });
+        }
+
+        if (document.readyState === 'loading') {
+            document.addEventListener('DOMContentLoaded', configureDesktopSearch);
+        } else {
+            configureDesktopSearch();
+        }
+    })();
+    </script>
+    <?php
+});
+
 /** True para la landing de Escuela, que no muestra título visible. */
 function fea_is_escuela_page(): bool {
     if (!is_page()) return false;