schema update

apps/admin/src/lib/validation/schemas.ts

@@ -15,8 +15,10 @@ export const passwordSchema = z
 
 export const phoneSchema = z
   .string()
-  .regex(/^\+?[1-9]\d{1,14}$/, "Invalid phone number format")
+  .optional()
-  .optional();
+  .refine((val) => !val || /^\+?[1-9]\d{1,14}$/.test(val), {
+    message: "Invalid phone number format",
+  });
 
 export const dateTimeSchema = z.string().datetime("Invalid datetime format");