Fixes
- Restored the production desktop authentication handoff endpoints, fixing Google, GitHub, and email sign-in/sign-up failures in v1.1.55.
- Added typed handling for authentication-service failures and clear localized error messages instead of silent email failures or generic errors.
Fixes #106.
Platform notes
- macOS artifacts are signed and notarized.
- Linux packages include detached GPG verification artifacts.
- Windows installers are unsigned because the CI/CD repository does not currently have a production Windows code-signing certificate and its SignPath configuration is test-only. Windows may show a SmartScreen warning. Tauri updater artifacts remain signed. This matches the v1.1.55 Windows release process.