Zareian 4700ccbf91 hearts: zero hearts really stops play ...

- The zero-hearts check moved inside the answer transaction: two wrong
  answers sent at once with one heart left were both accepted (reproduced
  with two threads).
- Finishing a lesson or an island without hearts and without having
  answered its questions is now 403 no_hearts; before, quiz/complete let
  a student move on island after island with zero hearts. Losing the last
  heart on the last question still finishes the island.
- A heart that came back while waiting is now saved before answering, so
  the reply no longer says 0 hearts left (the app then showed the
  no-hearts page to someone who had a heart).
- The 403 also carries fullRefillAt for the waiting screen.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-02 22:31:44 +03:30

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