fix: render correct font on Default font label

[briantstephan]

When switching from the "Default" font option to a different font, and then back to Default, the label for "Default" in the props menu would continue rendering with the previously selected font, even though that font was no longer getting used. This fixes that issue.

This screenshot shows the issue as it was before, which is now fixed.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 77b33404-c275-4673-8354-96b065ef10ee

📥 Commits

Reviewing files that changed from the base of the PR and between 8eca4e9 and c88ed4f.

📒 Files selected for processing (1)

• packages/visual-editor/src/internal/puck/components/FontSelector.tsx

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Walkthrough

FontSelector now converts the "default" font option to undefined before applying preview fontFamily styles to the selected trigger and font options. Its onChange callback prop now accepts a string value instead of any.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main fix: rendering the correct font for the Default label.
Description check	✅ Passed	The description matches the change by explaining the Default font label rendering issue and its fix.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch default-font-label

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