feat: polish envelopes (#2090)

## Description

The rest of the owl

packages/ee/server-only/limits/client.ts

@@ -1,6 +1,6 @@
 import { NEXT_PUBLIC_WEBAPP_URL } from '@documenso/lib/constants/app';
 
-import { FREE_PLAN_LIMITS } from './constants';
+import { DEFAULT_MINIMUM_ENVELOPE_ITEM_COUNT, FREE_PLAN_LIMITS } from './constants';
 import type { TLimitsResponseSchema } from './schema';
 import { ZLimitsResponseSchema } from './schema';
 
@@ -29,6 +29,7 @@ export const getLimits = async ({ headers, teamId }: GetLimitsOptions) => {
       return {
         quota: FREE_PLAN_LIMITS,
         remaining: FREE_PLAN_LIMITS,
+        maximumEnvelopeItemCount: DEFAULT_MINIMUM_ENVELOPE_ITEM_COUNT,
       } satisfies TLimitsResponseSchema;
     });
 };