Get a macro summary

What your assistant is told

Get the macro + hydration tally vs the user's targets for one LOCAL day. date is YYYY-MM-DD in the user's local calendar; pass their IANA tz (e.g. "Europe/Bucharest") so the day is bucketed locally — meals are stored in UTC, so without tz a late-night meal can fall in the wrong day. Returns consumed and target values; compute remaining = target − consumed.