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- Delete class.Log (unused), class.Mobile_Detect (outdated UA detection)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-basket/basket-mini.php

@@ -17,7 +17,7 @@
             case ( $count >= 5 ): echo 'produktów'; break;
           }
         ?></span><br />
-        <b><?= ucfirst( $lang['suma'] );?></b>: <span id="basket-value"><?= \S::decimal( \front\factory\ShopBasket::summary_price( $this -> basket, $this -> coupon ) );?></span> zł
+        <b><?= ucfirst( $lang['suma'] );?></b>: <span id="basket-value"><?= \Shared\Helpers\Helpers::decimal( \front\factory\ShopBasket::summary_price( $this -> basket, $this -> coupon ) );?></span> zł
       </div>
     </div>
   </a>