fix(CommandPalette/ContentSearch): improve performances and filtering logic

[benjamincanac]

🔗 Linked issue

Related to nuxt/nuxt.com#1857

❓ 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

• Throttle fuse search results to 16ms to prevent UI lag during fast typing
• Improve postFilter handling to filter out empty groups after post-filtering
• Move reusable logic to useContentSearch composable
• De-duplicate children in ContentSearch links
• Bind html on label and suffix only when necessary
• Export content and prose types

📝 Checklist

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

[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@5433

commit: afd73db