Deprecated: Import the appearance helpers from
@fluentui-react-native/design/theming instead. The token-pipeline mappers
(mapPipelineToTheme, mapFontPipelineToTheme, and mapPipelineToShadow)
are deprecated with no replacement; they remain available from
@fluentui-react-native/design/deprecated for existing platform themes.
This package is a compatibility shim and will not receive new APIs. It preserves
the existing entry point while consumers migrate to the design package.