Update V0.7.21

- Fixed a bug where stable capacity was not updated when a horse died.
- Fixed a bug where planning and building a shop would incorrectly count against the family’s buildable shop limit.
- Fixed an issue where shops could occasionally not be demolished or would cause errors when removed.
- The guaranteed appearance of a new estate now also applies beyond Year 20 (helpful for players with long-running saves).
- Optimized the guest-attracting mechanism in the teahouse: spending more now increases the chance of attracting guests.