Creature evolution milestone share card

[sonnymay]

Summary

When a monster evolves, it's a memorable moment but currently private. Adding a shareable evolution card would drive organic discovery of the app.

Acceptance criteria

• After a creature evolution animation completes, a "Share your evolution" button appears
• Tapping it generates a card with: creature name, new evolution art, level reached, and total focus hours
• Card uses the app's color palette and branding (not a generic screenshot)
• Share sheet uses React Native's Share API — works on iOS and Android
• Card is rendered via react-native-view-shot (captures the component as an image)
• Dismissible — player can skip sharing and continue without it blocking the flow

Stack

react-native-view-shot · React Native Share API