feat: add events calendar with CRUD, recurring events, and iCal sync (#271)

[JoesWalker]

closes #271

Description

Brief description of changes

Related Issue

Closes #

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Checklist

• Code follows project style guidelines

• Self-review completed

• No console errors

• Uses Lucide icons consistently

• Responsive design implemented

• Starknet best practices followed

  Summary

  Implements issue Events Calendar Integration #271 — Events Calendar Integration.

  Adds a full-featured events calendar to the TeachLink frontend with CRUD operations, recurring event support, iCal export, and Google Calendar sync.

  Changes

  • src/types/event.ts — CalendarEvent type (id, title, start, end, recurring?, recurrenceRule?)
  • src/components/Calendar.tsx — react-big-calendar component with day/week/month views, date-fns localizer, recurring event expansion,
    slot/event click handlers
  • src/utils/icalUtils.ts — iCal (.ics) file generation (RFC 5545), file download helper, Google Calendar URL builder
  • src/pages/events/index.tsx — Calendar list view with Export iCal button and New Event link
  • src/pages/events/new.tsx — Create event form (title, start, end, recurring toggle, RRULE selector)
  • src/pages/events/[id].tsx — Edit/delete form with Google Calendar sync link
  • src/pages/events/__tests__/events.test.tsx — 18 tests covering render, CRUD form submissions, recurring toggle, iCal content, and Google
    Calendar URL

  Features

  • 📅 Month, week, and day calendar views
  • ✏️ Create, edit, and delete events via existing apiClient pattern
  • 🔁 Recurring events with daily/weekly/monthly RRULE support, expanded across a 26-week window
  • 📥 Export all events as a .ics file
  • 🔗 "Sync with Google Calendar" deep-link on each event
  • ✅ 18/18 tests passing

  Testing

  npx vitest run src/pages/events/tests/events.test.tsx

  18 passed

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