feat(webapp): drop the switch surround on the onboarding emails row

Moves it to minimal/medium so it matches Icon contrast. The old className carried
a pr-3 that only made sense with the padded variant; without it the toggle lines
up with the other controls in the column.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: samejr

apps/webapp/app/routes/account._index/route.tsx

@@ -461,9 +461,8 @@ export default function Page() {
                   <Switch
                     id={marketingEmails.id}
                     name={marketingEmails.name}
-                    variant="medium"
+                    variant="minimal/medium"
                     defaultChecked={user.marketingEmails}
-                    className="w-fit pr-3"
                   />
                 </div>
               </div>