persist-1: onStoreDocument wrapped the page write in a try/catch that only
logged and swallowed the error, then resolved "successfully". hocuspocus
destroys/unloads the in-memory Y.Doc right after the hook resolves (the only
copy of the latest edit), so a transient DB error (deadlock, serialization
failure, dropped connection) silently lost the edit. Worse, the post-store
branch ran on the partially-assigned `page`, broadcasting a phantom
"page.updated" and enqueueing a history snapshot for content never written.
Wrap the write in a small bounded retry (3 attempts) so the save is
re-attempted while we still hold the doc, and clear `page` on failure so the
success-only side effects never report a save that didn't happen.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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