Filip 750290ddc1 Fix OPK loss on SPK-grace retry, deletion sync, add keys_updated push ...

- chat_core: defer one-time-prekey deletion until the first message
  decrypts successfully; deleting it on load made the SPK grace-period
  retry derive a wrong shared secret and lose the message permanently
- chat_core: fix get_deleted_since params (since -> since_ts) and
  response field (message_ids -> deleted_ids) so incremental deletion
  sync actually works
- chat_core: route keys_updated pushes into the notification queue
- server: notify contacts with keys_updated when a user uploads a new
  SPK or logs in with a new device, so clients invalidate cached key
  bundles instead of waiting for the TTL
- server: rate-limit download_stream like other heavy handlers

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-06-12 01:39:36 +02:00

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