The Reminder loose-end variant's due_at field is serialized as an ISO 8601
string (DateTime<Utc> on the wire), but the JS was doing:
const dueIn = (t.due_at || 0) - now;
A string minus a number is NaN in JS, so fmtAge(NaN) returned 'NaNd',
producing the 'due NaNd overdue' label seen in the screenshot.
Fix: parse the ISO string to unix seconds with new Date(...).getTime() / 1000
before the subtraction.
4c51a00c9f