feat(magic-link): require name for signup

[ouariachi]

What changes were made and why:

• Added a new configuration option requireNameForSignUp in the Magic Link plugin.
• When enabled, any attempt to create a new user via Magic Link without a non-empty name field will fail.
• This ensures new users always have a name, improving data consistency and preventing incomplete user records.
• Updated the plugin documentation to include the new requireNameForSignUp option and describe its behavior.

Relevant context:

• Currently, Magic Link signup allows creating users without a name.
• The recommended workaround (from issue comment) was to collect name later, but adding native support avoids extra steps and simplifies the flow.

Breaking changes / deprecations:

• No breaking changes.
• Flows without requireNameForSignUp enabled remain unchanged.

Tests / screenshots:

• Added test to verify that signup fails if name is missing when requireNameForSignUp is true.

Related issues / discussions:

• Closes #5139

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Summary by cubic

Added an option to require a non-empty name when creating new users via Magic Link signup. This prevents nameless accounts and improves data consistency.

• New Features
  • Added requireNameForSignUp (default: false).
  • When enabled (and sign up isn’t disabled), new user signup without a non-empty name redirects with ?error=NAME_REQUIRED_FOR_SIGNUP.
  • Updated docs to cover the new option.

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commit: 5784a96

[ping-maxwell]

I think you forgot to update your tests to use the lowercase error name, yet CI didn't fail. Is your test not working?

[ouariachi]

I think you forgot to update your tests to use the lowercase error name, yet CI didn't fail. Is your test not working?

Yes, I was checking the error code in the signIn response when it should be in the verify response.