Tapping Export with more than one exportable calendar now opens a picker
to choose which local calendars to include (all selected by default); a
single calendar exports straight through as before. Threads an optional
calendarIds filter through exportEvents/exportableEvents (null = all
eligible), so the auto-backup path is unaffected. The backup section is
now gated on there being at least one exportable (non-managed) calendar.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Jean-Luc Makiola
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