Update CSS styles for mobile registration interface and increment version code to 4.72.683

This commit modifies the CSS for the mobile registration interface, enhancing the visual hierarchy and readability by adjusting font weights and colors. The version code is updated to reflect these changes, ensuring consistency in versioning.

php/inc_settings.php

@@ -7,7 +7,7 @@
  * Constantes *
  *
  **************/
-define('_VERSION_CODE', '4.72.682');
+define('_VERSION_CODE', '4.72.683');
 define('_DATE_CODE', '2026-06-18');
 //MSIN-4290
 define('QR_SECRET_KEY', 'ms1_qr_2026_cle_secrete_longue_et_fixe');