feat: add subject display length to group setting schema

Author: david-roper

packages/schemas/src/group/group.ts

@@ -12,7 +12,8 @@ export const $GroupSettings = z.object({
       en: z.string().nullish(),
       fr: z.string().nullish()
     })
-    .nullish()
+    .nullish(),
+  subjectIdDisplayLength: z.number().nullish()
 });
 
 export type GroupType = z.infer<typeof $GroupType>;