Follow-up from #25's review feedback — that PR converted admin.ts + the global
error handler to application/problem+json (sendProblem/ProblemDetails), left
public.ts (the tablet-facing /api/* routes) on the old ad hoc { error } shape to
stay scoped to what #25 was actually fixing. Same conversion here, no functional
changes — every reply.code(N).send({ error }) becomes sendProblem(req, reply, N,
title, detail). Client already degrades gracefully either way (errText() in
Admin.tsx checks detail/title first, falls back to .error), so this was purely
consistency cleanup, not urgent.
typecheck+build clean.
bec4a0080c