kmptoolkit-language-compose

Compose Multiplatform wiring for kmptoolkit-language: AppLocale provides LocalLayoutDirection from an AppLanguage and forces a recomposition on language change, and Modifier.mirrorOnRtl() / mirrorOnLtr() flip a directional drawable that has no Compose auto-mirrored counterpart. Split from kmptoolkit-language so the base module stays plain Kotlin for consumers who read AppLanguageHolder outside Compose.