feat(Breadcrumb): add color prop

[maximepvrt]

Resolves #3052

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds an optional color prop to the Breadcrumb component and uses it when generating theme variants so active/link styles can vary by color. The breadcrumb theme removes hardcoded primary focus/text, introduces a color variant (including neutral), and adds compound variants to apply text-{color} for active items and focus-visible:outline-{color}. Documentation and the Nuxt playground were updated with a color: 'secondary' example, and a unit test was added to exercise the new prop.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The PR description is mostly empty with only an issue reference, but the title and code changes clearly indicate adding a color prop to Breadcrumb.	Add a detailed description explaining what the color prop does, why it was added to resolve issue #3052, and verify the documentation and type-of-change checkboxes are properly completed.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title 'feat(Breadcrumb): add color prop' directly and clearly describes the main change: adding a color prop to the Breadcrumb component. It follows conventional commit standards and matches the changeset content.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@6406

commit: c68c919