feat(FileUpload): add previewFile prop

[mdotme]

🔗 Linked issue

Resolves #5918

❓ 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

A new optional previewFile prop is added to the FileUpload component to control whether file previews are generated and displayed. The createObjectUrl function's return type is updated from string to string | undefined to reflect that it may not generate a blob URL. When previewFile is false, the function returns undefined; otherwise, it creates and returns a blob URL as before. Minor default value adjustments accompany the new prop.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description is related to the changeset, indicating the PR resolves issue #5918 and documents the type of change (enhancement and new feature).
Linked Issues check	✅ Passed	The PR fully addresses issue #5918 by implementing a previewFile prop to disable image previews, allowing consistent placeholder behavior across file types.
Out of Scope Changes check	✅ Passed	All changes are directly related to implementing the previewFile prop feature requested in issue #5918; no out-of-scope modifications detected.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title accurately and concisely summarizes the main change: adding a new previewFile prop to the FileUpload component.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 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@5935

commit: 06d957c