ver. 0.314: fix wyszukiwarki admin + title zamówienia

- Fix: globalna wyszukiwarka - Content-Type, Cache-Control, POST,
  FETCH_ASSOC, try/catch wrapper
- New: document.title w szczegółach zamówienia = numer zamówienia

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin/templates/shop-order/order-details.php

@@ -3,6 +3,7 @@ $orderId = (int)($this -> order['id'] ?? 0);
 ?>
 
 <div class="site-title">Szczegóły zamówienia: <?= htmlspecialchars((string)($this -> order['number'] ?? ''), ENT_QUOTES, 'UTF-8');?></div>
+<script>document.title = 'Zamówienie <?= htmlspecialchars((string)($this -> order['number'] ?? ''), ENT_QUOTES, 'UTF-8');?> - shopPro';</script>
 
 <div class="od-actions mb15">
   <a href="/admin/shop_order/list/" class="btn btn-dark btn-sm">

admin/templates/site/main-layout.php

@@ -322,7 +322,7 @@
 
           $.ajax({
             url: '/admin/settings/globalSearchAjax/',
-            type: 'GET',
+            type: 'POST',
             dataType: 'json',
             data: { q: phrase },
             success: function(response) {
@@ -333,8 +333,12 @@
 
               renderResults(response.items || []);
             },
-            error: function() {
-              $results.html('<div class="admin-global-search-empty">Błąd połączenia</div>').addClass('open');
+            error: function(xhr) {
+              var msg = 'Błąd połączenia';
+              if (xhr.status === 200) {
+                msg = 'Błąd parsowania odpowiedzi';
+              }
+              $results.html('<div class="admin-global-search-empty">' + msg + '</div>').addClass('open');
             }
           });
         }