- Replace nullable `OnlyLast` with non-nullable default `true`
- Support filtering by Envelope object (Id or Uuid) in addition to deprecated EnvelopeId
- Throw `BadRequestException` if no valid Envelope reference is provided
- Preserve status filtering and ordering for latest history entries
- Added `CountHistoryQueryExtensions.AnyHistoryAsync` for cleaner query usage via `ISender`.
- Removed `IMapper` from `CountHistoryQueryHandler` as it was unused.
- Removed unnecessary `using` directives to simplify imports.
- Kept query handling logic intact.
- Introduced `CountHistoryQuery` record for querying the count of history entries of an envelope.
- Implemented `CountHistoryQueryHandler` using repository pattern and AutoMapper.
- Supports optional filtering by `Status`.
- Throws `NotFoundException` if necessary (placeholder for future extension).
