Replace text with signature image in wash certificates

Updated the wash certificate template to include a signature image instead of plain text in the specified table cell. Added new image assets to support this update, ensuring proper rendering and appearance. This enhances the visual presentation of the certificates.

services/nginx/app/modules/html2pdf/templates/wash_certificate.php

@@ -164,8 +164,8 @@ class wash_certificate extends html2pdf_template
         return '
             <table style="position: absolute; top: 878px; left: 0; width: 100%; border-collapse: collapse; margin-left: ' . $margin_left_px . 'px; ' . $margin_right_px . 'px; align-content: space-between; max-height: ' . $column_height_px . 'px; min-height: ' . $column_height_px . 'px;">
                 <tr>
-                    <td style="width: ' . $column_width_px . 'px; align-content: center; text-align: center; border: 1px solid black; min-height: ' . $column_height_px . 'px; max-height: ' . $column_height_px . 'px;">
-                        <strong>' . htmlspecialchars($column_1, ENT_QUOTES, 'UTF-8') . '</strong>
+                    <td style="width: ' . $column_width_px . 'px; align-content: center; text-align: center; border: 1px solid transparent; min-height: ' . $column_height_px . 'px; max-height: ' . $column_height_px . 'px;">
+                       <img src="' . self::pathSrc('signature_truckwash_transparent.png') . '" alt="Signature" style="max-height: ' . $column_height_px . 'px; max-width: ' . $column_width_px . 'px; width: auto; height: auto;" />
                     </td>
                 </tr>
             </table>