Always show what the new yields will be when making decisions.

[Wolfsbro]

The game actually does a pretty good job of this, and overall does a much better job of it than VI did. But it needs to be more consistent.

Decision moments where you get to see what the new yields will be (great UI, no update needed!):
- Choosing which tile to work / where to place a specialist.
- Choosing where to place a building.
- Choosing which celebration option / narrative bonus to pick.
- Choosing where to send a merchant to start a trade route.

Decision moments where you don't get to see what the new yields will be (needs to be updated!):
- Choosing which policies to slot.
- Choosing legacy attributes.
- Starting research or cultural initiatives.