ui(segmentation): Design Prototype for split panel component (#4378)

platform/ui-next/tailwind.config.js

@@ -13,6 +13,7 @@ module.exports = {
       inter: ['Inter', 'sans-serif'],
     },
     fontSize: {
+      xxs: '0.6875rem', // 11px
       xs: '0.75rem', // 12px
       sm: '0.8125rem', // 13px
       base: '0.875rem', // 14px