refactor: replace FavoritesContext with zustand store#43
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React Context + Providerパターンからzustandに移行し、Provider不要でグローバル状態管理を簡潔にする。 Co-Authored-By: Claude <noreply@anthropic.com>
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Summary
Changes
src/shared/stores/useFavoritesStore.ts— zustandストア新規作成(useFavoritesStore+useFavoritesフック)src/shared/contexts/FavoritesContext.tsx— 削除src/shared/index.ts— exportをストアに切り替えapp/_layout.tsx—FavoritesProviderラッパーを削除__tests__/shared/stores/useFavoritesStore.test.tsx— zustandストア用テスト(Provider不要に)__tests__/shared/contexts/FavoritesContext.test.tsx— 削除__tests__/detail/screens/DetailScreen.test.tsx— Providerラッパー削除__tests__/favorites/screens/FavoritesScreen.test.tsx— 同上__tests__/home/screens/HomeScreen.test.tsx— 同上package.json— zustand v5.0.12 を追加Test plan
pnpm test— 全33スイート / 187テスト通過pnpm lint— エラーなしpnpm typecheck— 型エラーなしpnpm expo startで実機/シミュレータ動作確認Related Issues