fix(webapp): tighten the spacing above the SSO email message

The paragraph carried py-4, inherited from the form it replaces. A form needs
that room below it before the footer; a line of explanatory text with no footer
under it doesn't, and the modal read bottom-heavy. pt-2 keeps it clear of the
title and lets the dialog's own padding close the gap.

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

Author: samejr

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

@@ -585,7 +585,7 @@ function EditEmailButton({ isSsoManaged }: { isSsoManaged: boolean }) {
             <DialogTitle>Email address</DialogTitle>
           </DialogHeader>
           {isSsoManaged ? (
-            <Paragraph variant="small" className="py-4">
+            <Paragraph variant="small" className="pt-2">
               Your organization uses single sign-on, so your email address is managed by your
               identity provider rather than here. To change it, ask an organization admin to update
               it for you.