fix max page size incorrectly calculated (#409)

* fix max page size incorrectly calculated

* add pagination key to survive rerenders

Author: Rainson12

apps/web/app/dashboard/(unified)/(mail)/mail/[identityPublicId]/[mailboxSlug]/page.tsx

@@ -48,6 +48,7 @@ async function Page({
 				/>
 
 				<MailPagination
+					key={page}
 					count={count}
 					mailboxSlug={activeMailbox.slug}
 					identityPublicId={identityPublicId}

apps/web/components/mailbox/default/mail-pagination.tsx

@@ -38,7 +38,7 @@ function MailPagination({
 			<Pagination
 				value={activePage}
 				onChange={updatePageNumber}
-				total={count > 0 ? count / 50 : 0}
+				total={count > 0 ? Math.ceil(count / 50) : 0}
 			/>
 		</div>
 	);