Constraint: CssColor

[cursor]

Goal

Add a CssColor constraint — validate a string as a correct CSS color, following Symfony Validator logic.

Reference

• Symfony: Symfony\Component\Validator\Constraints\CssColor and its validator.
• Supported formats (hex, rgb, named colors, etc.) — match the reference.

Scope

• Constraint + validator, options if present in Symfony.
• Tests for each supported format and invalid strings.

Complexity

2 / 5.

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Migrated from Linear: IGO-8
Priority: High
Estimate: 2 points