fix(auth): redirect to login when signup email already exists

[vikram-2101]

This PR fixes an issue where attempting to sign up with an existing
email caused the CLI to loop back into the signup flow.

Updated behavior:

• Detects existing-account errors
• Informs the user clearly
• Redirects to the login flow instead of retrying signup

This prevents infinite loops and improves CLI UX.

[vikram-2101]

Hi maintainers 👋

This PR improves the signup UX by preventing retry loops
when an email already exists and redirects users to login instead.

Please let me know if any changes are required.
Happy to update.

Thanks!

[viferga]

The CI is failing, I won't merge it unless you solve it.

[vikram-2101]

Fixed the CI issue. It was a Prettier lint error due to line endings.
Please let me know if anything else needs adjustment.

[pkspyder007]

@vikram-2101 can you add test case for this change
you can add it to this file login.cli.integration.spec.ts

[vikram-2101]

@vikram-2101 can you add test case for this change you can add it to this file login.cli.integration.spec.ts

There is already a test for existing email but it was written for the signup logic which failes immediately. Now when it redirects to login instead of throwing an error, so I’ll update it accordingly.

[vikram-2101]

@pkspyder007 I’ve implemented the test case in login.cli.integration.spec.ts and pushed the update to the PR.