Private Sync 1.0.3-dev0.2

Dev prerelease.\n\nChanges:\n- Use per-file revision ids returned by the server after commit, with history fallback when needed.\n- Skip an upload if a local file changes while it is being read.\n- Validate chunked downloads against expected range and total sizes.\n- Treat only raw encrypted payload files as legacy encrypted notes, so inline encrypted text fragments stay as encrypted fragments locally.