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T3010: Contrast pairing names an undeclared part ​

Cause ​

A contrast pairing names a part the contract does not declare.

Example ​

xml
<contract>
{ "name": "Card", "role": "group", "parts": ["root"], "contrast": [{ "foreground": "label", "background": "root" }] }
</contract>
<template><div class="root"></div></template>

What you see ​

text
ERROR  T3010  app/components/Card.tess:2:84
  Contrast "foreground" names "label", which is not a declared part.
  Declared parts: "root".
  Run `tessera explain T3010` for details.

Fix ​

Use a declared part, or add the part to parts.

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