refactor: center align tabFooter buttons for improved layout consistency

Author: medyo

src/features/onboarding/components/steps/tabs.css

@@ -77,7 +77,7 @@
   column-gap: 12px;
   align-items: center;
   margin-top: 32px;
-  justify-content: flex-end;
+  justify-content: center;
 }
 .tabFooter button {
   border: none;