Add daily/weekly recurrence support

[sevenseat]

Adds daily/weekly recurrence support end-to-end.

What’s included

• New recurrence models and EventKit mapping for daily/weekly rules.
• add/edit support for --repeat, --interval, --count, --until.
• Default anchor: when --repeat is set without a due date, due date defaults to now.
• Recurrence summaries included in standard/plain output.
• Tests for parsing, formatting, and EventKit mapping.

Tests

• make check

[tossww]

Tested this PR on macOS Sequoia — works great! ✅

Tests performed:

• --repeat daily → Creates daily recurring reminder ✅
• --repeat weekly → Creates weekly recurring reminder ✅
• --repeat daily --interval 2 → Creates every-2-days reminder ✅

All reminders show correctly in Apple Reminders app (macOS + iOS sync).

This fills a major gap in the CLI. Would love to see this merged! 🙏