use isikukood library to validate in zod

packages/features/admin/src/lib/server/schema/create-company.schema.ts

@@ -1,5 +1,19 @@
+import Isikukood from 'isikukood';
 import { z } from 'zod';
 
+const personalCodeSchema = z.string().refine(
+  (val) => {
+    try {
+      return new Isikukood(val).validate();
+    } catch {
+      return false;
+    }
+  },
+  {
+    message: 'Invalid personal code',
+  },
+);
+
 /**
  * @name RESERVED_NAMES_ARRAY
  * @description Array of reserved names for team accounts
@@ -46,11 +60,7 @@ export const CompanyNameSchema = z
  */
 export const CreateCompanySchema = z.object({
   name: CompanyNameSchema,
-  ownerPersonalCode: z
-    .string()
-    .regex(/^[1-6]\d{2}(0[1-9]|1[0-2])(0[1-9]|[12]\d|3[01])\d{3}\d$/, {
-      message: 'Invalid Estonian personal code format',
-    }),
+  ownerPersonalCode: personalCodeSchema,
 });
 
 export type CreateCompanySchemaType = z.infer<typeof CreateCompanySchema>;