Track C (auth): User lived in @/hooks/useAuth; moved it to @/types
(re-exported from useAuth for the 7 importers) and typed me/login/
totpChallenge/hasUsers, dropping those Admin/Login casts. Left the
single-consumer non-money casts (adminUsers, version/about/privacy/
health docs) and the optimistic-UI rewrite as deliberate low-value/
high-churn stops.
Track D: global 500 handler now emits code:'INTERNAL_ERROR' so an
unexpected error carries the same {error,code} field as structured 4xx.
typecheck/lint(0 err)/build/server-193 all green; probe 17/17.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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