Summary

This PR removes remaining antd Select components from the project settings and error enhancement pages, replacing them with @highlight-run/ui ComboboxSelect to maintain consistent styling and reduce antd dependencies.

Changes

• GitHubSettingsModal.tsx: Replaced antd Select with ComboboxSelect from @highlight-run/ui
• GitHubEnhancementSettingsForm.tsx: Replaced antd Select with ComboboxSelect from @highlight-run/ui

Migration Details

The antd Select component was replaced with ComboboxSelect which provides:

• Consistent styling with the rest of the Highlight UI
• Better accessibility support
• Search/filter functionality
• Same core functionality (selecting from a list of GitHub repositories)

Testing

• Verified imports are correct
• Component props migrated appropriately:
  • placeholder → queryPlaceholder
  • onSelect → onChange
  • options (with label/value) → options (with id/render/value)
  • notFoundContent → emptyStateRender

/claim #8635

Fixes highlight/highlight#8635