7a00a1ee

Move login redirect decision into LoginTokenCreator

Instead of a redirectLoginTokens flag on handlers.Server, the prod
LoginTokenCreator now returns an empty Entry after sending the email.
The handler redirects only when the token is non-empty, which happens
naturally in dev mode (no email sent) and never in prod.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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• curl --netrc -H 'Accept: text/markdown' https://nix-ci.com/cb:mtlynch:little-moments/redirect-dev/7a00a1ee3122935ddef3d8668b1f7bc8d974d0a3

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