Guido Schmit 486cc9c622 feat(android): single birthday-calendar model + group-visible exclusion
- one birthday calendar per user: BirthdayDialog targets the single calendar and
  offers activation when none exists; VM birthdayCalendar()/ensureBirthdayCalendar()
- removed the birthday toggle from the generic new-calendar dialog
- exclude the birthday calendar from the group-visible ("shared calendar") picker

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-13 19:08:19 +02:00
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GPL-3.0 1.2 MiB
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Kotlin 100%