Improve the reward screen

Status: future design and implementation.

Goal

Make reward choices easier to understand and improve their presentation.

To do

• [ ] Design compact cards with icon, name, category and rarity cues.
• [ ] Show the selected card's description in a separate layout.
• [ ] Improve card entrance animation and rarity-based effects.
• [ ] Explore a clearer reward and chest-opening effect after the current overlap bug is fixed.

Locking a card is a separate future task.