feat(EE): MFA implementation for enterprise edition

- Add TOTP-based two-factor authentication
- Add backup codes support
- Add MFA enforcement at workspace level
- Add MFA setup and challenge UI pages
- Support MFA for login and password reset flows
- Add MFA validation for secure pages

apps/client/src/features/user/components/change-email.tsx

@@ -22,7 +22,7 @@ export default function ChangeEmail() {
 
   return (
     <Group justify="space-between" wrap="nowrap" gap="xl">
-      <div>
+      <div style={{ minWidth: 0, flex: 1 }}>
         <Text size="md">{t("Email")}</Text>
         <Text size="sm" c="dimmed">
           {currentUser?.user.email}
@@ -30,7 +30,7 @@ export default function ChangeEmail() {
       </div>
 
       {/*
-      <Button onClick={open} variant="default">
+      <Button onClick={open} variant="default" style={{ whiteSpace: "nowrap" }}>
         {t("Change email")}
       </Button>
       */}