- Backend now updates RRULE when recurrence_count or recurrence_end_date parameters are provided
- Fixed update_entire_series() to modify COUNT/UNTIL instead of preserving original RRULE
- Added comprehensive RRULE parsing functions to extract existing frequency, interval, count, until, and BYDAY components
- Fixed frontend parameter mapping to pass recurrence parameters through update_series calls
- Resolves issue where changing recurring event from 5 to 7 occurrences kept original COUNT=5
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Co-Authored-By: Claude <noreply@anthropic.com>
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