feat: Favorite Events in event switcher

[Copilot]

Users had no way to surface preferred events from an ever-growing list, requiring manual scrolling on every selection.

Changes

useFavoriteEvents hook (new)

• Persists favorite event IDs to AsyncStorage under @favorite_events
• Exposes favoriteEventIds, isFavorite(id), toggleFavorite(id)
• Handles storage errors gracefully (corrupt data, quota exceeded) by defaulting to [] and reverting optimistic UI updates on write failure

EventSelector

• Adds a star IconButton to every event row (filled = favorited, outline = not)
• Renders a Favorites section above Official/Unofficial/Retired when at least one event is favorited
• Multi-events (e.g. 333mbf) render Ticker + star side-by-side

Localization

• Added event.type.favorites → "Favorites" / "Favoritos" (en + es)

Tests

• Added @react-native-async-storage/async-storage jest mock to global setup
• Deleted stale EventSelector snapshot for regeneration

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