Main Street: hide card tooltip after card play

[SorraTheOrc]

Bug report from operator: when a card is played, its tooltip remains visible.

User story
As a player, when I play/buy a card and it leaves its source slot, any tooltip attached to that card should close immediately so stale UI does not remain on screen.

Acceptance criteria

1. After playing/buying a card in Main Street, no tooltip for that card remains visible.
2. Regression test reproduces prior behavior and passes with fix.
3. Existing tooltip hover behavior still works.
4. Full tests and build pass.