Fixes and improvements:

- Approved chores now show the correct date
- Deleting a chore clears it from the approval list
- Clear All in Quick Approve now works
- Copying a chore to another child keeps its schedule and coin value
- Pick a different celebration sound for each child on a shared chore
- Signed in with Apple? You can now add a password and use MyWins on an Android tablet too
- Coin totals can no longer go below zero