Add support for language/script fallback with a specific GenericFamily if available.
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xorgy commented
It is typical for a font stack to include a GenericFamily. Android and CoreText both have information about ‘UI’ type fonts in fallback, differentiated from general text fonts; and Android has support for setting fallback families for generic familes. We should be able to support preferentially matching system-ui to variant="compact" when available on Android, and matching serif (or ui-serif) to fallback fonts with fallbackFor="serif".
This information probably belongs in FallbackKey but it would need to be wired through the style resolver.