Citadel v0.4.2

Automated patch release.

Includes updater metadata (latest.json) for Tauri updater clients.

What's Changed

• chore(release): bump version to v0.4.1 by @phildenhoff in #95
• Import cover & ISBN from Hardcover by @phildenhoff in #96

Full Changelog: v0.3.1...v0.4.2