fix(link): set default for locale prop

[neukinal]

🔗 Linked issue

Fixes #6558

❓ 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

Explicitly define undefined as the default value for the locale prop. Without an explicit default, Vue's boolean casting implicitly casts the missing prop to false. This behavior previously caused auto-localization to be disabled by default.

📝 Checklist

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

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: cfb6050e-7b29-43b0-8e60-05593be6c322

📥 Commits

Reviewing files that changed from the base of the PR and between dc05151 and 133ddd4.

📒 Files selected for processing (1)

• src/runtime/components/Link.vue

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📝 Walkthrough

Walkthrough

This PR updates the Link component's prop defaults to explicitly set locale: undefined. Previously, the locale prop lacked an explicit default in withDefaults, causing downstream localization logic to not function correctly. The change ensures the locale prop is treated as unset when not provided, allowing the component's conditional locale-awareness logic (which checks props.locale === false and uses props.locale when calling $localePath) to operate as intended.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: setting a default value for the locale prop in the Link component.
Description check	✅ Passed	The description clearly explains the bug being fixed and references the linked issue, detailing why the explicit undefined default is necessary.
Linked Issues check	✅ Passed	The PR directly addresses issue #6558 by fixing Vue's implicit boolean casting of the locale prop, enabling auto-localization by default as documented.
Out of Scope Changes check	✅ Passed	The changes are narrowly scoped to the locale prop default in Link.vue and directly relate to resolving the linked issue requirement.
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

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[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@6563

commit: 133ddd4