[StripeCard] Make it more clear that a card has expired

When a card has expired, we should make it clearer.

- Add a card explaining what to do. Issue a new card? Transfer subscriptions?
- Make the expired date red? (but not an ugly red— make it fit within our theme)

<img width="323" height="50" alt="Image" src="https://github.com/user-attachments/assets/e00e9d57-4d78-42a1-a3ea-6da35b0efc3a" />

https://ui3.hcb.hackclub.com/stripe_cards/b5jh4D