hotfix: add validation for voucher value

Waiting for grassrootseconomics/cic-graph#39

src/components/voucher/forms/create-voucher-form/schemas/value-and-supply.ts

@@ -1,7 +1,7 @@
 import { z } from "zod";
 export const valueAndSupplySchema = z.object({
   uoa: z.string().trim(),
-  value: z.coerce.number(),
+  value: z.coerce.number().int('Value must be an integer. '),
   supply: z.coerce.number(), // Initial Mint
 });
 export type ValueAndSupplyFormValues = z.infer<typeof valueAndSupplySchema>;