Unify login and registration buttons with others

Author: moozzi

app/assets/stylesheets/components/session.css

@@ -139,12 +139,12 @@
   padding: var(--spacing-4);
   border: none;
   border-radius: 999px;
-  background: #d9480f;
-  color: #ffffff;
   font-size: var(--font-size-sm);
   font-weight: var(--font-weight-semibold);
   cursor: pointer;
   transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
+  background: var(--color-bg-button);
+  color: var(--color-text-button);
 }
 
 .session-submit:hover {