MenuItem used text-sm (14px) for its label, which read as oversized
for a dropdown; drop to text-xs (12px). This is a shared component
(AccountMenu, ContextMenu, MobileHeader's menu), so all of them get
the more compact sizing.
Add a border prop to GlassMenu (default true, unchanged for
ContextMenu) and set it false specifically on AccountMenu's dropdown,
per feedback that its border didn't fit.
Moves the login screen from /login to /auth, logout from /logout to
/auth/logout (alongside the existing /auth/login and /auth/callback
endpoints), and the public profile route from /u/[id] to /user/[id].
AUTH_REDIRECT_URI and AUTH_POST_LOGOUT_URI already point at
/auth/callback and / respectively, so no Zitadel config change is
needed for the auth move.