- one birthday calendar per user; BirthdaysImporter auto-creates/targets it
(no picker) and reconciles per-device (external_uid contact:<deviceId>:<id>)
so multiple devices don't clash
- Contacts birthday sync now runs on every "Sync with server" (syncFromServer),
not just app launch and the manual button
- report the device after each sync (POST /api/birthdays/sync-report) for the
web device list
- Accounts: Birthdays-from-Contacts section drops the target picker, keeps the
reminder picker; removed the birthday toggle from the generic new-calendar sheet
- New-birthday sheet targets the single calendar, offers activation if none
- exclude the birthday calendar from the group-visible ("shared calendar") picker
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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