Voyalier v0.4.1 — Flow-gap fixes

A small follow-up to v0.4.0 that closes a class of dead-end affordances — buttons that looked clickable but did nothing useful.

Fixed

Import and Add flight or stay primary buttons were enabled on an empty form, so clicking them only produced an error. They're now disabled until there's something to submit. (The .eml/.html/.txt file picker + drag-and-drop from v0.4.0 makes the non-paste path obvious.)
The vault unlock screen was a dead end on a forgotten passphrase — it now offers a "Forgot your passphrase?" explainer with the honest no-recovery reality and the restore-from-backup path.

Still a source-only public beta (build and run from source — see the README); signed installers remain blocked on paid certificates.

See the CHANGELOG for details.