Patch (backport #3297)

[mergify]

Changelist

[Describe or list the changes made in this PR]

Test Plan

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Author/Reviewer Checklist

• If this PR has changes that result in a different app state given the same prior state and transaction list, manually add the state-breaking label.
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Summary by CodeRabbit

• Bug Fixes

  • Added runtime validation for magic links during email sign-in; links not matching the configured validation template are rejected before processing.

• Chores

  • Added a configuration option to define the magic-link validation template (defaults to https://dydx.trade).

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This is an automatic backport of pull request #3297 done by [Mergify](https://mergify.com).

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