Scarriffle 29ddc5acbb Enforce a single birthday calendar per account (server-side) ...

- POST /local/calendars with is_birthday returns the existing birthday calendar
  if one exists (idempotent, no second created)
- PUT /local/calendars rejects (422) marking a second calendar as is_birthday

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-07-13 21:22:10 +02:00

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