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Recurring tasks were locked to fixed daily/weekly/biweekly/monthly/yearly intervals. The `custom` recurrence type and `recurrence_rule` field already existed in the model and API docs, but RRULE evaluation was a TODO stub that silently fell back to weekly, and no UI exposed the option. Implements real RRULE parsing via dateutil.rrule, and adds a builder UI (day-of-week checkboxes for weekly, day-of-month or Nth-weekday for monthly) so users can express patterns like "every other Wednesday" or "every second Tuesday" without hand-writing RRULE strings. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>