d8db281b

Return ErrUnregisteredEmail from NewSender instead of empty entry (#198)

NewSender now returns a magiclogin.ErrUnregisteredEmail error for
unknown addresses instead of silently returning an empty token entry.
Callers handle the error explicitly and redirect to /login/check-email.

Inline LoginConfirmPath into the dev creator and remove login_redirect.go.

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

Reviewed-on: https://codeberg.org/mtlynch/little-moments/pulls/198

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