0.5.0

Add i18n translation system with rich text support

- Add translate() and translateAnnotated() composable functions
- Add TranslatableText and TranslatableAnnotatedText components
- Add Component.toAnnotatedString() extension for rich text preservation
- Add LocalLocale CompositionLocal for reactive language changes
- Add TranslationTest command for testing
- Add comprehensive KDoc documentation for all public APIs
- Bump version to 0.5.0
- Update README with translation documentation