af60719b

Simplify login POST test to verify handler redirect behavior

The test was exercising dev-mode creator logic (LoginConfirmPath +
magiclogin.NewSender) rather than the handler's own behavior. Replace
with a simple mock that returns a fixed redirect path and verify the
handler issues a 303 to it.

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

Agent Instructions

Each run corresponds to one flake attribute. Click a run for its logs and status.

Example: https://nix-ci.com/cb:mtlynch:little-moments/redirect-dev/af60719ba376ff261efecf471ba48d9454477839/7218a1e7-435e-449e-b2da-67d6e06371ec

Wait for suite to complete:

curl --netrc -N https://nix-ci.com/cb:mtlynch:little-moments/redirect-dev/af60719ba376ff261efecf471ba48d9454477839/wait

This page is also available in machine-friendly formats. Request one with the Accept header:

• curl --netrc -H 'Accept: application/json' https://nix-ci.com/cb:mtlynch:little-moments/redirect-dev/af60719ba376ff261efecf471ba48d9454477839
• curl --netrc -H 'Accept: text/markdown' https://nix-ci.com/cb:mtlynch:little-moments/redirect-dev/af60719ba376ff261efecf471ba48d9454477839

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