refactor(validation): refactor createDonationSchema to use discriminatedUnion

Refactored the createDonationSchema from a combination of .object().and(z.union()) to a discriminatedUnion based on the "anonymous" field. This improves type safety and validation logic by explicitly handling anonymous and identified donations, ensuring customAmount is properly validated in both cases. The change maintains the same validation rules while simplifying the schema structure.

lib/validation-schemas.ts

@@ -80,28 +80,25 @@ export const customAmountSchema = z
 
 // Schema completo para criação de doação
 export const createDonationSchema = z
-  .object({
-    tier: donationTierSchema,
-    anonymous: z.boolean().optional().default(false),
-    customAmount: z.number().optional(),
-  })
-  .and(
-    z.union([
-      // Doação anônima - não precisa de dados pessoais
-      z.object({
-        anonymous: z.literal(true),
-      }),
-      // Doação identificada - precisa de todos os dados
-      z.object({
-        anonymous: z.literal(false),
-        donorName: nameSchema,
-        donorEmail: emailSchema,
-        donorPhone: phoneSchema,
-        donorTaxId: documentSchema,
-        donorMessage: messageSchema,
-      }),
-    ])
-  )
+  .discriminatedUnion("anonymous", [
+    // Doação anônima
+    z.object({
+      tier: donationTierSchema,
+      anonymous: z.literal(true),
+      customAmount: z.number().optional(),
+    }),
+    // Doação identificada
+    z.object({
+      tier: donationTierSchema,
+      anonymous: z.literal(false),
+      donorName: nameSchema,
+      donorEmail: emailSchema,
+      donorPhone: phoneSchema,
+      donorTaxId: documentSchema,
+      donorMessage: messageSchema,
+      customAmount: z.number().optional(),
+    }),
+  ])
   .refine(
     (data) => {
       // Se tier for custom, customAmount é obrigatório