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- Delete class.Log (unused), class.Mobile_Detect (outdated UA detection)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>

templates/shop-category/category-description.php

@@ -3,7 +3,7 @@
   <div id="visible"><?= $this->category['language']['text']; ?></div>
   <div id="hidden"><?= $this->category['language']['text_hidden']; ?></div>
   <? if ($this->category['language']['text_hidden']) : ?>
-  <a href="#" class="btn"><?= \S::lang('wiecej'); ?></a>
+  <a href="#" class="btn"><?= \Shared\Helpers\Helpers::lang('wiecej'); ?></a>
   <? endif; ?>
 </div>
 <? endif; ?>
@@ -14,10 +14,10 @@
       e.preventDefault();
       if ($('#category-description #hidden').is(':visible')) {
         $('#category-description #hidden').slideToggle();
-        $('#category-description .btn').html('<?= \S::lang('wiecej'); ?>');
+        $('#category-description .btn').html('<?= \Shared\Helpers\Helpers::lang('wiecej'); ?>');
       } else {
         $('#category-description #hidden').slideToggle();
-        $('#category-description .btn').html('<?= \S::lang('mniej'); ?>');
+        $('#category-description .btn').html('<?= \Shared\Helpers\Helpers::lang('mniej'); ?>');
       }
     });
   });