Release 2.4.2

Release Note

Features

• feat(backup): rolling error log, preflight diagnostics, panic-safe status
• add non-interactive export (#274)
• chore(compliance): add per-binary third-party license reports

Fixes

• fix(imap): reuse one gap-fill session, retry connection failures, defer throttled folders (#396)
• fix(core): persist highest_uid when incremental sync finds no new mail (#411)
• fix(core): accumulate gap-fill header progress across batches (#410)

What's Changed

• fix(core): accumulate gap-fill header progress across batches by @Korov in #410

Full Changelog: 2.4.1...2.4.2