fix(CheckboxGroup): update update:modelValue emit type

[LouisHaftmann]

❓ 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

Current type of update:modelValue does not respect the valueKey prop. Only a type change is required since it already uses valueKey at runtime.

[coderabbitai]

📝 Walkthrough

Walkthrough

The PR updates src/runtime/components/CheckboxGroup.vue to change the emits typing. CheckboxGroupEmits now accepts a second generic VK (default 'value') and is redefined to Omit the original root emits' update:modelValue, add a change: [event: Event], and include GetModelValueEmits<T, VK, true>. The component's defineEmits invocation is updated from CheckboxGroupEmits<T> to CheckboxGroupEmits<T, VK>.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: updating the emit type for update:modelValue in CheckboxGroup to respect the valueKey prop.
Description check	✅ Passed	The description is directly related to the changeset, explaining that the PR fixes the type of update:modelValue to respect the valueKey prop, with only type changes needed.
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@5927

commit: f3264ae

[benjamincanac]

Thanks! 😊