- Treat a record whose server row is gone as a remote delete only when the
local file still matches the sidecar's base hash. An edit made after the
remote delete is newer than the delete, so it uploads and revives the row
instead of being removed.
- Revive a tombstone with the same user and guid in cmdDeckUpload instead of
inserting a second row next to it, so the deck keeps its id and version
history and the promise in servatrice.ini.example holds.
- Run tombstone purging on its own clock, driven by the new
[deck_sync] purge_interval option, so disabling share cleanup no longer
disables purging silently.
- Write the base snapshot through QSaveFile and log a failed commit, so a
crash or a full disk cannot leave a truncated base for DeckDiff::merge().
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