Merge pull request #10366 from overleaf/ds-buttons-user-bonus

[web] Use new buttons on bonus page, primary email check, and gallery item page

GitOrigin-RevId: f5ac40f45b0698054f52560b4b722e1c3b18b5c6

services/web/app/views/referal/bonus.pug

@@ -115,7 +115,7 @@ block content
 
 
 							.modal-footer()
-								button.btn.btn-default(
+								button.btn.btn-secondary(
 									ng-click="cancel()",
 								)
 									span #{translate("close")}

services/web/app/views/user/primaryEmailCheck.pug

@@ -24,7 +24,7 @@ block content
 							span(data-ol-inflight="idle") #{translate("yes_that_is_correct")}
 							span(hidden data-ol-inflight="pending") #{translate("confirming")}…
 
-					a.btn-default.btn.btn-block.btn-primary-email-check-button(
+					a.btn-secondary.btn.btn-block.btn-primary-email-check-button(
 						href="/user/settings#add-email"
 						data-ol-slow-link
 						event-tracking="primary-email-check-change-email"