docs(calendar): add week numbers example

[MuhammadM1998]

🔗 Linked issue

Related to #4555

❓ 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

Adds a documentation example for the new weekNumbers prop introduced in #4555.

📝 Checklist

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

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a "Week Numbers" section to the calendar component documentation describing the week-numbers prop. The example code block is updated to include weekNumbers: true alongside the existing fixedWeeks: true, and the prose explains how to display week numbers in the calendar. No functional code changes or exported/public declarations were modified.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title 'docs(calendar): add week numbers example' clearly and concisely describes the main change: adding documentation with a week numbers example to the calendar component.
Description check	✅ Passed	The pull request description is directly related to the changeset, explaining that it adds a documentation example for the new weekNumbers prop introduced in issue #4555.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@5931

commit: cc66886

[benjamincanac]

Thanks! 😊