v0.1.2

- Fix: Use settings API key for list refresh (no longer requires env var)
- Fix: macOS DMG filename now includes architecture (x86_64/arm64)
- Bump version to 0.1.2 in Cargo.toml, scripts, README, About tab
- Add error checking for packaging steps
- Improve AppImage and DEB packaging robustness
- Windows: Prevent terminal window for GUI app
- General: CI and packaging improvements for all platforms