fix: améliorer lisibilité bandeau succès (jaune doré + text-shadow)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

styles/roll.less

@@ -755,7 +755,8 @@
       background-color: var(--cel-green, #0c4c0c);
       background-image: url("../assets/ui/fond_cadrille.jpg");
       background-blend-mode: soft-light;
-      color: var(--cel-orange, #e07b00);
+      color: #ffd870;
+      text-shadow: 0 1px 3px rgba(0,0,0,0.7), 0 0 8px rgba(0,0,0,0.4);
     }
 
     &.critical-success {