Citadel v0.5.0-nightly.20260615.112

Automated nightly release.

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

What's Changed

• fix: settings window blank in production builds by @phildenhoff in #120
• feat(metadata): read/write book languages instead of hardcoded "en" by @phildenhoff in #130

Full Changelog: v0.6.0...v0.5.0-nightly.20260615.112