- Remove all WPCFTO wrapper components (MetaboxLayout, TabNav, TabPanel, GroupTitle, etc.)
- Use shadcn Tabs with horizontal underline triggers
- Use grid-cols-[1fr_2fr] for clean form field layout
- Use shadcn Switch for toggle fields
- Use shadcn Select for discount type dropdown
- Replace inline Notice with toast notifications
- Add Skeleton loading state
- Add SearchableSelect with Badge chips for relation fields
- Move save button to tab header bar
- No custom CSS classes - all Tailwind utilities
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