migrated from zod v3 to zod v4

assets/stubs/index.ts

@@ -21,7 +21,7 @@ export type BaseModel = z.infer<typeof BaseModel>;
 export const AdminModel = z.object({
   ...BaseModel.shape,
   avatar: z.string(),
-  email: z.string().email(),
+  email: z.email(),
 });
 export type AdminModel = z.infer<typeof AdminModel>;
 
@@ -37,7 +37,7 @@ export type RecordModel = z.infer<typeof RecordModel>;
 export const pbJsonField = (maxSizeInBytes: number = 1048576) => {
   const literalSchema = z.union([z.string(), z.number(), z.boolean(), z.null()]);
   const jsonSchema: z.ZodType<any> = z.lazy(() =>
-    z.union([literalSchema, z.array(jsonSchema), z.record(jsonSchema)])
+    z.union([literalSchema, z.array(jsonSchema), z.record(z.string(), jsonSchema)])
   );
 
   const stringTransform = z.string()