A page op saved as in flight before the app closed is only waiting to be
replayed after a restart; nothing is sending it. discardDeletedPage kept
every in-flight record, so offline, OK could never clear the deleted
page's work and the user stayed on a page that no longer exists. It now
keeps a record only while this process is sending its strategy, the same
rule the queue view uses.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>