API/MCP support for fill type PATTERN

Since Figma introduced vector Pattern fill, it works pretty nice, yet there are some limitations and missing features.

Claude does really good work generating lots of patterns, yet it doesn’t understand well the underlying mechanism around it
With further investigations, it looks like the API doesn’t support generating fill type `PATTERN`

node.fills = [{ type: "PATTERN", sourceNodeId, tileType, scalingFactor, spacing, ... }] throws a discriminator validation error. PATTERN is absent from the accepted set, which currently lists SOLID, SHADER, the four gradients, IMAGE, VIDEO.
Reads work fine, so the type round-trips as data but can't be written back. Even re-assigning an unmodified pattern paint read off an existing node fails.
createPaintStyle() accepts the call and silently stores a SOLID instead. The silent degradation is arguably its own bug and worth mentioning separately, since it fails without erroring.
clone() preserves pattern fills correctly, which shows the underlying data model is fine and it's purely the setter validator that's gating this.

When you work with the pattern source (eg a dot) and apply a color variable (eg. pattern-color, which has light and dark mode [or any]) the PATTERN doesn’t understands it; therefore you need to create fills for light and dark background. Would be great if PATTERN could support using colors from variable modes

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