refactor(auth): replace relative imports with @zen/core alias

Update BaseLayout imports in auth email templates to use the
`@zen/core/email/templates` module alias instead of relative paths,
improving maintainability and consistency across the codebase.

src/features/auth/templates/PasswordChangedEmail.jsx

@@ -1,5 +1,5 @@
 import { Section, Text } from "@react-email/components";
-import { BaseLayout } from "../../../core/email/templates/BaseLayout.jsx";
+import { BaseLayout } from "@zen/core/email/templates";
 
 export const PasswordChangedEmail = ({ email, companyName }) => (
   <BaseLayout

src/features/auth/templates/PasswordResetEmail.jsx

@@ -1,5 +1,5 @@
 import { Button, Section, Text, Link } from "@react-email/components";
-import { BaseLayout } from "../../../core/email/templates/BaseLayout.jsx";
+import { BaseLayout } from "@zen/core/email/templates";
 
 export const PasswordResetEmail = ({ resetUrl, companyName }) => (
   <BaseLayout

src/features/auth/templates/VerificationEmail.jsx

@@ -1,5 +1,5 @@
 import { Button, Section, Text, Link } from "@react-email/components";
-import { BaseLayout } from "../../../core/email/templates/BaseLayout.jsx";
+import { BaseLayout } from "@zen/core/email/templates";
 
 export const VerificationEmail = ({ verificationUrl, companyName }) => (
   <BaseLayout