Refine billing schema and enhance visuals of PricingTable

Removed redundant validation for 'lifetime' subscription plans in billing schema. Extensively updated the UI, layout and visuals of PricingTable component to offer a more user-friendly and aesthetically pleasing interface, improving overall user experience.

packages/billing/core/src/create-billing-schema.ts

@@ -104,21 +104,6 @@ export const PlanSchema = z
       path: ['lineItems'],
     },
   )
-  .refine(
-    (data) => {
-      if (data.paymentType === 'one-time') {
-        const meteredItems = data.lineItems.filter(
-          (item) => item.type === 'metered',
-        );
-
-        return meteredItems.length === 0;
-      }
-    },
-    {
-      message: 'One-time plans must not have metered line items',
-      path: ['paymentType', 'lineItems'],
-    },
-  )
   .refine(
     (data) => {
       if (data.paymentType === 'one-time') {
@@ -126,6 +111,8 @@ export const PlanSchema = z
 
         return baseItems.length === 0;
       }
+
+      return true;
     },
     {
       message: 'One-time plans must not have non-base line items',