✨(frontend) add monthly "nth weekday" recurrence option

[nicolasaunai]

Purpose

Users could not create an event recurring on e.g. "the 1st Tuesday of
every month" — the monthly recurrence editor only supported "on day N
of the month" (BYMONTHDAY), with no way to express an ordinal
weekday (BYDAY=1TU).

Proposal

• Add a "day of the week" sub-mode to the monthly recurrence editor,
  alongside the existing "day of month" option, with ordinal (1st /
  2nd / 3rd / 4th / last) + weekday selects.

• ts-ics already serializes byDay: [{ day, occurrence }] correctly
  to RRULE (BYDAY=1TU, BYDAY=-1FR, ...), so no backend or CalDAV
  changes were needed.

• Added unit tests for the new helpers and translations (en/fr/nl).

• make test-front

• make typecheck-front

• make lint-front

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 9fbb8d2e-1f29-4c13-89ea-e077652e70e9

📥 Commits

Reviewing files that changed from the base of the PR and between 9bb5200 and 03f9c3b.

📒 Files selected for processing (5)

• CHANGELOG.md
• src/frontend/src/features/calendar/components/scheduler/RecurrenceEditor.scss
• src/frontend/src/features/calendar/components/scheduler/RecurrenceEditor.tsx
• src/frontend/src/features/calendar/components/scheduler/__tests__/RecurrenceEditor.helpers.test.ts
• src/frontend/src/features/i18n/translations.json

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