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- Delete class.Log (unused), class.Mobile_Detect (outdated UA detection)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/shop/class.ProductAttribute.php

@@ -50,11 +50,11 @@ class ProductAttribute implements \ArrayAccess
       $lang_id = ( new \Domain\Languages\LanguagesRepository( $mdb ) )->defaultLanguage();
 
     $result = $mdb -> get( 'pp_shop_attributes', '*', [ 'id' => $attribute_id ] );
-    if ( \S::is_array_fix( $result ) ) foreach ( $result as $key => $val )
+    if ( \Shared\Helpers\Helpers::is_array_fix( $result ) ) foreach ( $result as $key => $val )
       $this -> $key = $val;
 
     $results = $mdb -> select( 'pp_shop_attributes_langs', '*', [ 'AND' => [ 'attribute_id' => $attribute_id, 'lang_id' => $lang_id ] ] );
-    if ( \S::is_array_fix( $results ) ) foreach ( $results as $row )
+    if ( \Shared\Helpers\Helpers::is_array_fix( $results ) ) foreach ( $results as $row )
       $this -> language = $row;
   }