Extend recurring event expansion date range from 30 days to 100 years in the past.
This ensures yearly recurring events created many years ago (birthdays, anniversaries,
historical dates) properly generate their current year occurrences.
The backend correctly includes old recurring events that could have occurrences in
the requested month, but the frontend was only expanding occurrences within a
30-day historical window, missing events from previous years.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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