ver. 0.283: Legacy class cleanup — S, Html, Email, Image, Log, Mobile_Detect → Shared namespace

- Migrate class.S → Shared\Helpers\Helpers (140+ files), remove 12 unused methods
- Migrate class.Html → Shared\Html\Html
- Migrate class.Email → Shared\Email\Email
- Migrate class.Image → Shared\Image\ImageManipulator
- Delete class.Log (unused), class.Mobile_Detect (outdated UA detection)
- Remove grid library loading from admin (index.php, ajax.php)
- Replace gridEdit usage in 10 admin templates with grid-edit-replacement.php
- Fix grid-edit-replacement.php AJAX to send values as JSON (grid.js compat)
- Remove mobile layout conditionals (m_html/m_css/m_js) from Site + LayoutsRepository
- Remove \Log::save_log() calls from OrderAdminService, ShopOrder, Order

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

autoload/front/factory/class.ShopOrder.php

@@ -133,7 +133,7 @@ class ShopOrder
         'payment_method' => $payment_method[ 'name' ],
         'payment_method_id' => $payment_id,
         'hash' => $hash,
-        'summary' => \S::normalize_decimal( $basket_summary + $transport_cost ),
+        'summary' => \Shared\Helpers\Helpers::normalize_decimal( $basket_summary + $transport_cost ),
         'coupon_id' => $coupon ? $coupon -> id : null,
         'message' => $basket_message ? $basket_message : null,
         'apilo_order_status_date' => date( 'Y-m-d H:i:s' ),
@@ -230,8 +230,8 @@ class ShopOrder
     $regex = "-(<a[^>]+href\s*=\s*['\"])(((?!'|\"|https?://).)*)(['\"][^>]*>)-i";
     $mail_order = preg_replace( $regex, "$1" . $base . "://" . $_SERVER[ 'SERVER_NAME' ] . "$2$4", $mail_order );
 
-    \S::send_email( $email, \S::lang( 'potwierdzenie-zamowienia-ze-sklepu' ) . ' ' . $settings[ 'firm_name' ], $mail_order );
-    \S::send_email( $settings[ 'contact_email' ], 'Nowe zamówienie / ' . $settings[ 'firm_name' ] . ' / ' . $order['number'] . ' - ' . $order['client_surname'] . ' ' . $order['client_name'], $mail_order );
+    \Shared\Helpers\Helpers::send_email( $email, \Shared\Helpers\Helpers::lang( 'potwierdzenie-zamowienia-ze-sklepu' ) . ' ' . $settings[ 'firm_name' ], $mail_order );
+    \Shared\Helpers\Helpers::send_email( $settings[ 'contact_email' ], 'Nowe zamówienie / ' . $settings[ 'firm_name' ] . ' / ' . $order['number'] . ' - ' . $order['client_surname'] . ' ' . $order['client_name'], $mail_order );
 
     // zmiana statusu w realizacji jeżeli płatność przy odbiorze
     if ( $payment_id == 3 )