fix(payments): fix TypeScript cast errors in polar webhook handler

Cast through unknown to satisfy TS strict overlap check for
PolarSubscription and PolarOrder types from Record<string, unknown>.

ui/src/routes/api/webhooks/polar/+server.ts

@@ -42,11 +42,11 @@ export const POST: RequestHandler = async ({ request }) => {
 			case 'subscription.updated':
 			case 'subscription.canceled':
 			case 'subscription.revoked':
-				await handleSubscriptionEvent(type, data as Parameters<typeof handleSubscriptionEvent>[1]);
+				await handleSubscriptionEvent(type, data as unknown as Parameters<typeof handleSubscriptionEvent>[1]);
 				break;
 
 			case 'order.created':
-				await handleOrderCreated(data as Parameters<typeof handleOrderCreated>[0]);
+				await handleOrderCreated(data as unknown as Parameters<typeof handleOrderCreated>[0]);
 				break;
 
 			default: